Original sentence: The group was formed (as Rainbow) in 1970, and its most notable early members were bassist Gene Klein (Chaim Witz) (later Gene Simmons) and rhythm guitarist Stanley Eisen (later Paul Stanley)
Edited sentence: The group was formed (as Rainbow) in 1970, and its most notable early members were bassist Gene Simmons (Chaim Witz) (later Gene Simmons) and rhythm guitarist Stanley Eisen (later Paul Stanley)