Adverbial, relative and non-finite complex sentences revision

Any complex sentence is formed of at least one main clause joined to at least one subordinate clause. There are different types of subordinate clause: adverbial clause, relative clause and non-finite clause. Any subordinate clause is a group of words that contains a verb and does not make complete sense. There are three types of complex sentence: adverbial, relative and non-finite. There are comma rules associated with clause demarcation in complex sentences.