Complex sentence: Liquid light shows or psychedelic light shows surfaced in the early 1960s as accompaniment to electronic music and avant-garde theatre performances and were later adapted for performances of rock or psychedelic music.
Split into simpler sentences: Liquid light shows or psychedelic light shows are a form of light art that surfaced in the early 1960s as accompaniment to electronic music and avant-garde theatre performances. They were later adapted for performances of rock or psychedelic music.