Harvey's presence on the show is sure to hold a ton of promise for Season 4, especially because it means that Claire officially has someone in her corner to help her get a leg up on her husband (which, spoiler, is going to be very important to Claire's #goals this season!).
Independent clauses can stand alone as sentences. To be independent, a clause must contain a verb and asubject and not begin with a subordinating word or phrase.
A subordinate clause contains a subordinate conjunction, a subject, and a verb. Because this type of clause does not express a complete thought, it cannot stand alone as a complete sentence. Read this example: Flooring the accelerator, Juan wove through the heavy traffic.