Complex sentence: It was believed that much of Norwood's minor hockey success was attributed to the Brethen Coliseums' small, tight quarters which ice surface measured at 186 feet long by 72 feet wide.
Split into simpler sentences: It was believed that much of Norwood's minor hockey success was attributed to the Brethen Coliseums' small, tight quarters. The ice surface was measured at 186 feet long by 72 feet wide.