Here are the answers to the given statements above:
1. The given sentence is an example of a complex sentence. This sentence includes an independent clause and dependent clause.
2. The given sentence is an example of a simple sentence. It only contains one independent clause.
3. This is an example of a fragment sentence, which misses the predicate.
4. This is an example of a simple sentence having a compound predicate. Hope this answer helps.
Answer:
I love this, I didn't find it confusing at all and it was very clear about what was happening. I'm sure your Honors class will adore it!
The first revision ("Charlie is taking a dance class because he has to rather than because he enjoys it") is the correct answer :)