Writing.Com General Discussion

Just as Northernwrites said! If it's of any help at all, you can think of it like this.

A subordinating conjunction is not a conjunction that connects a dependent clause to an independent clause. A subordinating conjunction subordinates what might otherwise have been an independent thought. To emphasize, compare, contrast, or otherwise indicate some relationship in time or space, a subordinating conjunction makes another clause dependent upon the main clause, giving it that extra bit of meaning or implication.

I only slept for three hours and waking up this morning was difficult are two independent and complete thoughts, but we can subordinate that first idea to the second and make it explicit that "I only slept for three hours" is the cause of my difficulties.

Waking up this morning was difficult because I only slept for three hours.