Complex sentence: Moulson grew up in Mississauga, Ontario playing minor hockey for the AAA Mississauga Senators of the GTHL until Bantam when he returned to AA hockey with the Mississauga Braves as a Midget.
Split into simpler sentences: Moulson grew up in Mississauga, Ontario, playing minor hockey for the AAA Mississauga Senators of the GTHL. He played for the Senators until Bantam, when he returned to AA hockey with the Mississauga Braves as a Midget.