Problem: How does the sentence end?

Dennis was teaching Derrick how to kick when swimming since 
Answer: Derrick had been swimming for only a few weeks now.

Problem: How does the sentence end?

Kenneth asked Craig for advice on treating shin splints because 
Answer: Craig was a professional runner and had experienced them before.

Problem: How does the sentence end?

When she had to take medicine, she preferred chewable tablets rather than pills because the 
Answer: chewable tablets were easy to take.

Problem: How does the sentence end?

The variety of cars that Katrina had compared to Elena was amazing, and it was because 
Answer:
Katrina is rich.