The answer to your question would be that the answer that identifies the type of clause used in the sentence and the word being modified is the following one: Adverb clause; reviews.
An adverb clause is a group of words that functions as an adverb in the sentence. As they are dependent clauses, they must have a subordinating conjunction to connect them to the rest of the sentence. In this case, the subordinating conjunction introducing the adverbial clause is "before". What is more, the adverbial clause in question gives information regarding the time in which the the coach reviewed the new plays with the team.
