Complex sentence: Powell began Casey Powell's World Lacrosse Foundation, a 501 (c) 3 organization dedicated to enriching lives around the world through the joys of lacrosse in Summer 2015 and is also a founder of Speed Lacrosse, a modified version of the sport.
Split into simpler sentences: Powell began Casey Powell's World Lacrosse Foundation, a 501 (c) 3 organization for the advancement of lacrosse in Summer 2015. He is a founder of Speed Lacrosse, a modified version of the sport.