Which sentence combination uses a subordinating clause?

A subordinating clause is a dependent clause that cannot stand alone as a complete sentence and is introduced by a subordinating conjunction (e.g., because, although, while). For example, in the combination "Although it was raining, we decided to go for a hike," the first part "Although it was raining" is the subordinating clause. This structure contrasts with a simple sentence that consists of two independent clauses joined by a coordinating conjunction.