Complex sentence: In the 1960s it boasted a Cinerama screen, but by the early 1970s had declined to the point of showing blaxploitation films; it was restored and reopened as a performing arts venue in the late 1970s.
Split into simpler sentences: In the 1960s it boasted a Cinerama screen, but by the early 1970s it had declined to the point of showing blaxploitation films. It was restored and reopened as a performing arts venue in the late 1970s.