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 primary division for the discussion of clauses is the distinction between main clauses (i.e. matrix clauses, independent clauses) and subordinate clauses (i.e. embedded clauses, dependent clauses). A main clause can stand alone, i.e. it can constitute a complete sentence by itself. A subordinate clause (i.e. embedded clause), in contrast, is reliant on the appearance of a main clause; it depends on the main clause and is therefore a dependent clause, whereas the main clause is an independent clause.