Because the roads were flooded, the school opened two hours late.
150 Complex Sentence Examples
Browse a larger categorized library built for this specific writing intent. Search the collection, filter by situation, and compare how the underlying pattern changes with purpose and context.
What to notice in the examples
Complex sentences are valuable because they show hierarchy: the writer signals which idea is central and which idea provides context, limitation, cause, or condition.
- Identify the independent clause first.
- Find the subordinating word or relative pronoun that creates dependency.
- Use punctuation according to clause order and function.
- Keep the dependent clause close to the idea it modifies.
The school opened two hours late because the roads were flooded.
Although the first draft was clear, the conclusion needed stronger evidence.
When the lights dim, the audience becomes quiet.
The editor returned the chapter after she checked every citation.
If the temperature drops below freezing, the valve closes automatically.
The bicycle that I bought last summer still needs a new chain.
While the team waited for approval, the designer prepared two alternatives.
The café, which opened last month, already has a loyal morning crowd.
Since the data came from different years, the comparison requires caution.
Even though the room was crowded, the speaker never raised her voice.
Before the interview begins, test the recorder and confirm consent.
Because the final dataset arrived late, the team postponed the analysis meeting.
The proposal succeeded after the authors narrowed the scope that reviewers had criticized.
'Because the first sample was contaminated, the team repeated the test before reporting the result' is complex because one dependent clause is joined to one independent clause.
Because the server restarted, the upload stopped.
Because the teacher posted the rubric, the train reached the station.
Although the teacher posted the rubric, the train reached the station.
When the teacher posted the rubric, the train reached the station.
If the teacher posted the rubric, the train reached the station.
Because the librarian reserved the study room, mira closed the kitchen window.
Although the librarian reserved the study room, mira closed the kitchen window.
When the librarian reserved the study room, mira closed the kitchen window.
If the librarian reserved the study room, mira closed the kitchen window.
Because the class completed the practice quiz, the neighbor returned the borrowed ladder.
Although the class completed the practice quiz, the neighbor returned the borrowed ladder.
When the class completed the practice quiz, the neighbor returned the borrowed ladder.
If the class completed the practice quiz, the neighbor returned the borrowed ladder.
Because the tutor explained the equation, a cyclist crossed the bridge.
Although the tutor explained the equation, a cyclist crossed the bridge.
When the tutor explained the equation, a cyclist crossed the bridge.
If the tutor explained the equation, a cyclist crossed the bridge.
Because the editor marked the repeated sentence, the baker packed the morning orders.
Although the editor marked the repeated sentence, the baker packed the morning orders.
When the editor marked the repeated sentence, the baker packed the morning orders.
If the editor marked the repeated sentence, the baker packed the morning orders.
Because the analyst updated the forecast, the dog carried the red ball.
Although the analyst updated the forecast, the dog carried the red ball.
When the analyst updated the forecast, the dog carried the red ball.
If the analyst updated the forecast, the dog carried the red ball.
Because our team documented the final decision, the student revised the final paragraph.
Although our team documented the final decision, the student revised the final paragraph.
When our team documented the final decision, the student revised the final paragraph.
If our team documented the final decision, the student revised the final paragraph.
Because the manager approved the revised timeline, the teacher posted the rubric.
Although the manager approved the revised timeline, the teacher posted the rubric.
When the manager approved the revised timeline, the teacher posted the rubric.
If the manager approved the revised timeline, the teacher posted the rubric.
Because the designer shared the prototype, the librarian reserved the study room.
Although the designer shared the prototype, the librarian reserved the study room.
When the designer shared the prototype, the librarian reserved the study room.
If the designer shared the prototype, the librarian reserved the study room.
Because the coordinator sent the agenda, the class completed the practice quiz.
Although the coordinator sent the agenda, the class completed the practice quiz.
When the coordinator sent the agenda, the class completed the practice quiz.
If the coordinator sent the agenda, the class completed the practice quiz.
Because the engineer tested the backup system, the tutor explained the equation.
Although the engineer tested the backup system, the tutor explained the equation.
When the engineer tested the backup system, the tutor explained the equation.
If the engineer tested the backup system, the tutor explained the equation.
Because the lantern lit the empty hallway, the editor marked the repeated sentence.
Although the lantern lit the empty hallway, the editor marked the repeated sentence.
When the lantern lit the empty hallway, the editor marked the repeated sentence.
If the lantern lit the empty hallway, the editor marked the repeated sentence.
Because the detective opened the sealed envelope, the analyst updated the forecast.
Although the detective opened the sealed envelope, the analyst updated the forecast.
When the detective opened the sealed envelope, the analyst updated the forecast.
If the detective opened the sealed envelope, the analyst updated the forecast.
Because the musician played the final chord, our team documented the final decision.
Although the musician played the final chord, our team documented the final decision.
When the musician played the final chord, our team documented the final decision.
If the musician played the final chord, our team documented the final decision.
Because the painter covered the old sign, the manager approved the revised timeline.
Although the painter covered the old sign, the manager approved the revised timeline.
When the painter covered the old sign, the manager approved the revised timeline.
If the painter covered the old sign, the manager approved the revised timeline.
Because the child followed the silver footprints, the designer shared the prototype.
Although the child followed the silver footprints, the designer shared the prototype.
When the child followed the silver footprints, the designer shared the prototype.
If the child followed the silver footprints, the designer shared the prototype.
Because the storm shook the loose shutters, the coordinator sent the agenda.
Although the storm shook the loose shutters, the coordinator sent the agenda.
When the storm shook the loose shutters, the coordinator sent the agenda.
If the storm shook the loose shutters, the coordinator sent the agenda.
Because the council approved the tree-planting plan, the engineer tested the backup system.
Although the council approved the tree-planting plan, the engineer tested the backup system.
When the council approved the tree-planting plan, the engineer tested the backup system.
If the council approved the tree-planting plan, the engineer tested the backup system.
Because the clinic mailed the appointment reminders, the lantern lit the empty hallway.
Although the clinic mailed the appointment reminders, the lantern lit the empty hallway.
When the clinic mailed the appointment reminders, the lantern lit the empty hallway.
If the clinic mailed the appointment reminders, the lantern lit the empty hallway.
Because the museum opened the new exhibit, the detective opened the sealed envelope.
Although the museum opened the new exhibit, the detective opened the sealed envelope.
When the museum opened the new exhibit, the detective opened the sealed envelope.
If the museum opened the new exhibit, the detective opened the sealed envelope.
Because the volunteers sorted the donated books, the musician played the final chord.
Although the volunteers sorted the donated books, the musician played the final chord.
When the volunteers sorted the donated books, the musician played the final chord.
If the volunteers sorted the donated books, the musician played the final chord.
Because the bus driver reported the broken display, the painter covered the old sign.
Although the bus driver reported the broken display, the painter covered the old sign.
When the bus driver reported the broken display, the painter covered the old sign.
If the bus driver reported the broken display, the painter covered the old sign.
Because the gardener watered the young trees, the child followed the silver footprints.
Although the gardener watered the young trees, the child followed the silver footprints.
When the gardener watered the young trees, the child followed the silver footprints.
If the gardener watered the young trees, the child followed the silver footprints.
Because the river carried the fallen branches, the storm shook the loose shutters.
Although the river carried the fallen branches, the storm shook the loose shutters.
When the river carried the fallen branches, the storm shook the loose shutters.
If the river carried the fallen branches, the storm shook the loose shutters.
Because the wind moved the dry leaves, the council approved the tree-planting plan.
Although the wind moved the dry leaves, the council approved the tree-planting plan.
When the wind moved the dry leaves, the council approved the tree-planting plan.
If the wind moved the dry leaves, the council approved the tree-planting plan.
Because the sun warmed the stone wall, the clinic mailed the appointment reminders.
Although the sun warmed the stone wall, the clinic mailed the appointment reminders.
When the sun warmed the stone wall, the clinic mailed the appointment reminders.
If the sun warmed the stone wall, the clinic mailed the appointment reminders.
Because the rain filled the shallow ditch, the museum opened the new exhibit.
Although the rain filled the shallow ditch, the museum opened the new exhibit.
When the rain filled the shallow ditch, the museum opened the new exhibit.
If the rain filled the shallow ditch, the museum opened the new exhibit.
Because the tide covered the lower steps, the volunteers sorted the donated books.
Although the tide covered the lower steps, the volunteers sorted the donated books.
When the tide covered the lower steps, the volunteers sorted the donated books.
If the tide covered the lower steps, the volunteers sorted the donated books.
Because the frost silvered the garden fence, the bus driver reported the broken display.
Although the frost silvered the garden fence, the bus driver reported the broken display.
When the frost silvered the garden fence, the bus driver reported the broken display.
If the frost silvered the garden fence, the bus driver reported the broken display.
Because the train reached the station, the gardener watered the young trees.
Although the train reached the station, the gardener watered the young trees.
When the train reached the station, the gardener watered the young trees.
If the train reached the station, the gardener watered the young trees.
Because mira closed the kitchen window, the river carried the fallen branches.
Although mira closed the kitchen window, the river carried the fallen branches.
When mira closed the kitchen window, the river carried the fallen branches.
If mira closed the kitchen window, the river carried the fallen branches.
Because the neighbor returned the borrowed ladder, the wind moved the dry leaves.
Although the neighbor returned the borrowed ladder, the wind moved the dry leaves.
When the neighbor returned the borrowed ladder, the wind moved the dry leaves.
If the neighbor returned the borrowed ladder, the wind moved the dry leaves.
Because a cyclist crossed the bridge, the sun warmed the stone wall.
Although a cyclist crossed the bridge, the sun warmed the stone wall.
When a cyclist crossed the bridge, the sun warmed the stone wall.
If a cyclist crossed the bridge, the sun warmed the stone wall.
Because the baker packed the morning orders, the rain filled the shallow ditch.
Although the baker packed the morning orders, the rain filled the shallow ditch.
Keep the underlying decision or pattern, then replace the subject, evidence, relationship, constraints, and tone with details that belong to your situation. If your final line still works after swapping only one noun, it may be too close to the example.