4.6 Subordination

In grammar, subordination is the process by which we join two clauses, so that one depends on the other. As a result, they are called main clause and subordinate clause. The use of subordinating conjunctions (when joining adverb clauses) and relative pronouns (in the case of adjective clauses), is an indicator of subordination.

I'm happy when i'm working.

[Main clause] subordinating conjunction [subordinate clause] 

We drink because it's what men do.
[Main clause] subordinating conjunction [subordinate clause]

We decided to keep business, but run it past Detroit, which means Bob gets involved.

[Main clause] cc [main clause] relative pronoun [subordinate clause]

And since this is it...

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Source:http://grammar.about.com/od/c/g/coordterm07.htm