Final answer:
The sentence is a complex sentence because it contains one main clause and one subordinate clause.
Step-by-step explanation:
The correct term that identifies the sentence 'After all, I have always been a night owl, and I prefer moonlight to sunlight.' is complex sentence. A complex sentence contains one main clause (a clause that contains a subject and a predicate and can stand alone as a sentence) and one or more subordinate clauses. In this sentence, 'After all, I have always been a night owl' is the main clause, and 'and I prefer moonlight to sunlight' is the subordinate clause.