Complex sentence: For the first time in his career, Huet started a season as the undisputed number one goaltender, but as the 2009-10 campaign wore on, Antti Niemi eventually replaced Huet as the starter going into the playoffs.
Split into simpler sentences: For the first time in his career, Huet entered the 2009--2010 season as the undisputed number one goaltender. However, Antti Niemi eventually replaced Huet as the starter going into the playoffs.