Diagram the sentence, Although it was raining fairly hard, the team played its best game ever

Although it was raining fairly hard, the team played its best game ever.

This is a complex sentences whcih contains two clauses : a main clause and a subordinate clause of concession.

The main clause is the team played its best game ever. The subordiante clause of concession is introduced by the subordinating conjunction Although.

The team is the subject of the main clause in this sentence. Within that main clause played its best game ever is the predicate. Within the predicate its best game is the direct object and ever, an adverb of time.

It is the subject of the subordinate clause of concession and was raining fairly hard, the predicate. The conjugated verbal phrase was raining has an adverbial phrase of manner fairly hard. Hard is the head of the phrase and fairly an adverb of degree.