Complex sentence: Messier then proved to be the x-factor in the game, scoring a natural hat trick in the third period to led the Rangers to a 4-2 victory and send the series back to New York for the deciding Game Seven.
Split into simpler sentences: Messier then proved to be the x-factor in the game, scoring a natural hat trick in the third period. He led the Rangers to a 4-2 victory, and back to New York for the deciding game seven.