Complex sentence: He wore jersey number 21 for the Toronto Maple Leafs and the St. Louis Blues, number 19 for the Flames, and number 10 for the San Jose Sharks.
Split into simpler sentences: He wore jersey number 21 for the Toronto Maple Leafs and the St. Louis Blues, and number 19 for the Flames. He now wears jersey number 10 for the San Jose Sharks.