Conversation so far:
when did The Undertones form?
The Undertones formed in 1974.
how did The Undertones form?
The Undertones members were five friends from Creggan and the Bogside, who originally drew inspiration from such artists as the Beatles, Small Faces and Lindisfarne.
who were the five friends from Creggan and the Bogside, who originally drew inspiration from such artists as the Beatles, Small Faces and Lindisfarne in The Undertones?
the Undertones consisted of Feargal Sharkey, John O'Neill, Damian O'Neill, Michael Bradley and Billy Doherty.
who else was a part ofThe Undertones besides Feargal Sharkey, John O'Neill, Damian O'Neill, Michael Bradley and Billy Doherty?
Vincent O'Neill left The Undertones; being replaced by his younger brother Damian.

Question: why did vincent leave the band?
Self-contained rewrite: why did vincent leave The Undertones?