Problem: How does the sentence end?

The acid reflux of Erin was worse than Kayla because 
Answer: Erin ate has eaten terrible foods for a long time.

Problem: How does the sentence end?

Rachel didn't know how to be humble and Tanya did because 
Answer: Rachel got angry with people very easily.

Problem: How does the sentence end?

William liked to exercise on a regular basis, but Randy hated it, so 
Answer: Randy was in a much sorrier condition.

Problem: How does the sentence end?

So 
Answer:
Rachel was scared by the pig because Rachel has been attacked by one before and Samantha owns a farm.