Complex sentence: Connolly revealed that the chorus had been written first, expressing that he was "bored and sitting around", and told "Billboard", "I probably could have talked about anything and made the song silly and stupid".
Split into simpler sentences: Connolly revealed that the chorus had been written first, expressing that he was "bored and sitting around". He told "Billboard", "I probably could have talked about anything and made the song silly and stupid".