Complex sentence: Rowe rejoined in the mid- 1970s, and shortly thereafter, Gare departed, leaving a Rowe-Prévost duo for a period before pianist John Tilbury--previously an occasional AMM collaborator--joined in about 1980.
Split into simpler sentences: Rowe rejoined in the mid- 1970s, and shortly thereafter, Gare departed, leaving a Rowe-Prévost duo for a period. Pianist John Tilbury--previously an occasional AMM collaborator--joined in about 1980.