Complex sentence: Cable enlisted singer Freddie Mercury to sing lead vocals on these tracks, who in turn suggested bringing his band-mates from Queen, Roger Meddows-Taylor and Brian May to add percussion, guitar and backing vocals.
Split into simpler sentences: Cable enlisted singer Freddie Mercury from the band Queen to sing lead vocals on these tracks. Mercury in turn suggested bringing his band-mates Roger Meddows-Taylor and Brian May to add percussion, guitar and backing vocals.