The answer to your question is that the pace of the writing slows.
Explanation:
Two clauses joint together by a conjunction form a compound sentence.
Compound sentences add more details to the story, and giving more details helps a story flow slowly and interestingly, helping keep the readers attention. slow sentences therefore give readers the pace required to truly enjoy a book
Compound sentences will exaggerate a thought, reckoning on the case given. they will link concepts along to explain one thing in additional depth.
A clause will be a sentence if it's a subject matter and a verb however not all clauses do. A clause could be a unit structured around a phrase. If you would like associate degree example of a clause (this could be a conditional clause).
