Complex sentence: Sally is a terrific singer, best known for her rendition of the song "Air" in "Hair", performed a live solo album called "Farewell American Tour", and she sings the blues with her partner Cliff Grishman.
Split into simpler sentences: Sally is a professional singer, best known for her rendition of the song "Air" in "Hair". She performed a live solo album called "Farewell American Tour", and she sings the blues with Cliff Grishman.