Complex sentence: Unlike "The Pros and Cons of Hitch Hiking (tour)" in 1984, the K.A.O.S. tour established The Bleeding Heart band, a backing band which would continue to play or be involved with Roger Waters over the next 20 years.
Split into simpler sentences: Unlike "The Pros and Cons of Hitch Hiking (tour)" in 1984, the K.A.O.S. tour established The Bleeding Heart band. A number of these musicians would continue to play or be involved with Roger Waters over the next 20 years.