Answer:
1. Tell the truth and you will feel better.
After you tell the truth, you will feel better.
2. I love cats but I am allergic to cat hair.
Though I love cats, I am allergic to cat hair.
3. I called Manu and he came at once.
When I called Manu, he came at once.
4. He has everything but he doesn't seem happy.
Even though he has everything, he doesn't seem happy.
5. They saw the snake and ran away.
When they saw the snake, they ran away.
Explanation:
Compound sentences are those sentences that contain at least two independent clauses joined by the coordinating conjunctions FANBOYS (for, and, nor, but, or, yet, so). On the other hand, a complex sentence has a dependent clause and an independent clause.
The given compound sentences are joined by the coordinating conjunctions (and, but, and, but, and). To change or make them into a complex sentence, we can start the sentence with the subordinating conjunctions (after, though, when, even though, when). Then, we require a comma to separate the dependent from the independent clause in complex sentences.
Thus, the final sentences in the complex form will be-
After you tell the truth, you will feel better.
Though I love cats, I am allergic to cat hair.
When I called Manu, he came at once.
Even though he has everything, he doesn't seem happy.
When they saw the snake, they ran away.
