Complex sentence: After repeated attempts to match their earlier success, the group had a complete lineup change in 1965, and in 1968 and all-female lineup was brought in until the group broke up in 1971.
Split into simpler sentences: After repeated attempts to match their earlier success, the group had a complete lineup change in 1965. In 1968 and all-female lineup was brought in until the group broke up in 1971.