Conversation so far:
When did Moss return to racing?
In 1980 he made a comeback to regular competition.
Where did Moss compete after he returned to racing?
in the British Saloon Car Championship with the works-backed GTi Engineering Audi team.
Did Moss win when he returned to racing?
CANNOTANSWER.

Question: Why did Moss leave racing?
Self-contained rewrite: Why did Moss leave racing?