Complex sentence: After the original group broke up after its 1975 tour, Mulligan formed his own band, Mulligan Stew, which eventually fostered a revival of The Beau Brummels, which, at different times, included also Ron Elliott, Sal Valentino and Ron Meagher.
Split into simpler sentences: After the original group broke up after its 1975 tour, Mulligan formed his own band, Mulligan Stew, which eventually fostered a revival of The Beau Brummels. At different times, the reformed band also included Ron Elliott, Sal Valentino and Ron Meagher.