In grammar, a sentence is considered as a compound-complex sentence when it integrates a compound sentence that includes at least two independent clauses, and a complex sentence that includes at least one dependent clause. Let's remember a clause is dependent if it is incomplete without another sentence.
This occurs in the sentence presented because the clause "Because he wants to make the track team" is independent as it expresses an incomplete idea and it is introduced by the word "because" that shows its dependency. On the other hand, "Travis runs three miles after school every day" and "his father times him" are complete and therefore, independent clauses. As a result, you have one dependent clause and two independent and thus, this is a compound-complex sentence.
