Conversation so far:
When did Tom Hafey coach?
Tom Hafey was a coach between 1966 and 1988.
What team was Tom Hafey the coach of?
Tom Hafey coached four clubs: Richmond, Collingwood, Geelong and Sydney
What happened during Tom Hafey's  coaching years?
As coach, Tom Hafey lead Richmond to a total of four premierships: 1967, 1969, 1973 and 1974.

Question: Was he an successful coach?
Self-contained rewrite: Was Tom Hafey a successful coach?