Complex sentence: Using female session vocalists for their first recordings, they scored a hit single in the United Kingdom in 1974 with the song "Save Me", and realised they would need to find a public face for what was at the time only a studio group.
Split into simpler sentences: Using female session vocalists for their first recordings, they scored a hit single in the United Kingdom in 1974 with the song "Save Me". They then realised they would need to find a public face for what was at the time only a studio group.