Simple Sentences Express complete, independent thoughts. Dogs are cute. Dogs want attention.
Dogs make messes.
I do not want a cat. The simple sentence is ideal when what you have to say is a single thought. Without unrelated and unnecessary words and thoughts confusing the issue, your meaning will be much easier for readers to grasp. Further, you will often want to show that an idea has two or more closely related thoughts, which can not easily be done with simple sentences. Compound Sentences Join two ideas to show a relationship of equal importance.