Complex sentence: The group's most celebrated song the autobiographical Serious Drugs (recorded in 1991 but not released until 1993) was groundbreaking its use of lush arrangement ideas and smoothe vocal harmonies at a time when "indie" records still usually sounded rough and ready.
Split into simpler sentences: The group's most celebrated song the autobiographical "Serious Drugs" (recorded in 1991 but not released until 1993). The song was groundbreaking in its use of lush arrangement ideas and smoothe vocal harmonies at a time when "indie" records usually sounded rough and ready.