Complex sentence: In the early seasons, Courage spoke English quite often, but his dialogue became increasingly limited to gibberish and screaming as the series progressed, only speaking once in a while or when he really had something to say.
Split into simpler sentences: In the early seasons, Courage spoke English quite often, but his dialogue became increasingly limited to gibberish and screaming with only occasional dialogue as the series progressed. He would only say something once in a while or when he really has something to say.