Final answer:
The sentence "She enjoys reading books and writing stories" is classified as a simple sentence because it consists of one main clause with a single subject and a compound predicate, without any subordinate or additional independent clauses.
Step-by-step explanation:
The sentence "She enjoys reading books and writing stories" is an example of a simple sentence. This is because it contains a single main clause with one subject ("She") and a compound predicate ("enjoys reading books and writing stories"). There are no subordinate clauses or additional independent clauses in this sentence, which would be necessary to classify it as either a compound, complex, or compound-complex sentence.