Conversation so far:
When did Nathan Buckley begin coaching?
Nathan Buckley signed a 5-year deal with the Collingwood Football Club. He was the assistant coach for the seasons of 2010 and 2011
Was Nathan Buckley ever head coach?
Nathan Buckley then became head coach in 2012

Question: How was his time as assistant coach?
Self-contained rewrite: How was Nathan Buckley's time as assistant coach?