Conversation so far:
What were the internal problems of Sly and the Family Stone?
Relationships within Sly and the Family Stone were deteriorating; there was friction in particular between the Stone brothers and Larry Graham.
What was the friction between Sly and Freddie Stone based on?
Epic requested more marketable output. The Black Panther Party demanded that Sly replace Gregg Errico and Jerry Martini with black instrumentalists and fire manager David Kapralik.
Are there any other interesting aspects about Sly and the Family Stone besides friction between the Stone brothers and Larry Graham?
Between summer 1969 and fall 1971, Sly and the Family Stone released only one single, Thank You / Everybody Is a Star, released in December 1969.
What become of the Sly and Family Stone single, Thank You?
Sly and the Family Stone's Thank You reached the top of the Billboard Hot 100 in February 1970.
Did the band Sly and the Family Stone break up?
Following the Radio City engagement, Sly and the Family Stone was dissolved.

Question: who else left before it was officially broken up?
Self-contained rewrite: who else left before Sly and the Family Stone was officially broken up?