Compound complex sentences are sentences with coordinated independent clauses and less dependent clauses. Since Bart set his alarm, for once he made it to class on time is the best revision.
Compound sentences are composed of 2 independent clauses and are connected by the coordinating conjunctions including the following words as coordinate: for, and, nor, but, or, yet, and so.
Complex sentences include independent and one dependent clause in the sentences and begins with subordinating conjunctions in sentences like since, because, before, until, though, if, although, etc.
As the third sentence contains, since in the starting of the sentence, and for in the middle it has both compound and complex words in it.
Therefore, option C. Since Bart set his alarm, for once he made it to class on time is the best revision of the sentence.
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