Complex sentence: Returning to L.A. they were inspired to form the power trio they dubbed the Hollywood Squares with bass player Spider Cobb (aka Bob Schell), who had migrated to L.A. in early 1977 to work as an arranger.
Split into simpler sentences: Returning to L.A. they were inspired to form the power trio they dubbed the Hollywood Squares with bass player Spider Cobb (aka Bob Schell). Cobb had migrated to L.A. in early 1977 to work as an arranger.