Complex sentence: The group broke up shortly afterwards, when Chong attempted to have the Vancouvers' contract halved, so that he, Taylor, and Henderson would constitute the group, while other members would simply be regarded as sidemen and session artists.
Split into simpler sentences: The group broke up shortly afterwards, when Chong tried to reduce the number of players covered by the Vancouvers' contract. He intended that he, Taylor, and Henderson would constitute the group, while other members would be classified as sidemen and session artists.