Problem: How does the sentence end?

I decided to sew the pillows instead of bags because the
Answer: pillows are easier to sew.

Problem: How does the sentence end?

Jason found very complicated mathematics less frustrating than Dennis, because
Answer: Jason had an analytical mind.

Problem: How does the sentence end?

So
Answer: Justin dropped the tape because Benjamin needed to tape something together while Justin didn't.

Problem: How does the sentence end?

The guide that Derrick used was very knowledgable compared to Randy's guide, therefore
Answer:
Randy learned less.