Complex sentence: Except for the Allround World Championship, Tomas Gustafson achieved everything he ever aimed for in speedskating: three Olympic gold medals, one Olympic silver medal, and setting the 10,000 m world record twice.
Split into simpler sentences: Except for the Allround World Championship, Tomas Gustafson achieved everything he ever aimed for in speedskating. Three Olympic gold medals, one Olympic silver medal, setting the 10000 m world record twice.