Complex Sentences:
1. Although the rain poured relentlessly, the hikers continued their journey, determined to reach the summit. (Subordinating conjunction "although" introduces a dependent clause)
2. Because she had studied diligently, she aced the exam, earning a perfect score. (Subordinating conjunction "because" introduces a dependent clause)
3. While the children played in the park, their parents enjoyed a quiet coffee break. (Subordinating conjunction "while" introduces a dependent clause)
4. Unless you practice regularly, you will not improve your musical skills. (Subordinating conjunction "unless" introduces a dependent clause)
5. Since the weather was ideal, we decided to have our picnic in the backyard. (Subordinating conjunction "since" introduces a dependent clause)
Compound Sentences:
6. The sun was shining brightly, and the birds were singing happily. (Coordinating conjunction "and" joins two independent clauses)
7. I finished my homework, but I still have to clean my room. (Coordinating conjunction "but" joins two independent clauses)
8. She loves to read, or she enjoys spending time with her friends. (Coordinating conjunction "or" joins two independent clauses)
9. The train arrived late, for it was delayed due to a track problem. (Conjunctive adverb "for" joins two independent clauses)
10. He wanted to go to the beach, however, he was too busy with work. (Conjunctive adverb "however" joins two independent clauses)
Compound-Complex Sentences:
11. Although the rain was pouring, we decided to go for a walk, because we wanted to get some exercise. (Contains both a dependent clause introduced by "although" and two independent clauses joined by "because")
12. While the chef prepared the meal, the guests chatted animatedly, and they laughed at the jokes. (Contains a dependent clause introduced by "while" and two independent clauses joined by "and")
13. Because she was feeling unwell, she went to bed early, but she couldn't fall asleep. (Contains a dependent clause introduced by "because" and two independent clauses joined by "but")
14. The children were excited about the trip, for they had never been to the zoo before, and they couldn't wait to see the animals. (Contains a dependent clause introduced by "for" and two independent clauses joined by "and")
15. Since it was a beautiful day, we decided to go for a hike, however, we had to turn back early due to the sudden downpour. (Contains a dependent clause introduced by "since" and two independent clauses joined by "however")