Complex sentence: Before issuing several singles on her own Vibrato Records label, she recorded two albums worth of material at Radio Recorders for Dunhill Records which went unnoticed, then retired from singing in the early 1970s.
Split into simpler sentences: Before issuing several singles on her own Vibrato Records label, she recorded two albums of material at Radio Recorders for Dunhill Records, which went unnoticed. She then retired from singing in the early 1970s.