Conversation so far:
What happened in 1965?
There, Phillips was a founding member of the Mamas & the Papas, helping to form the vocal group in 1965.
Who was in it?
Cass, John, Michelle, Dennie.
What was their first project together?
Doherty and John Phillips had reconciled and ostensibly written I Saw Her Again (1966) about the episode.
What was that about?
An affair the previous year between Phillips and bandmate Denny Doherty had been forgiven.
How was that received?
CANNOTANSWER.

Question: Why did they do that?
Self-contained rewrite: Why did Doherty and Phillips fire Michelle?