Complex sentence: The music video starts off where the group was performing in the'Check The Rhime' video with a crowd cheering, but then Phife notices that the police have come to arrest them, so the group runs into the cleaners store to hide.
Split into simpler sentences: The music video starts off where the group was performing in the Check The Rhime video with a crowd cheering. But then Phife notices that the police have come to arrest them and so the group runs into the cleaners store to hide.