Complex sentence: In addition, Gretzky's jersey number 99 was retired league-wide at the 2000 NHL All-Star Game, a decision inspired by Major League Baseball's retirement of the number 42 worn by Jackie Robinson.
Split into simpler sentences: In addition, Gretzky's jersey number 99 was retired league-wide at the 2000 NHL All-Star Game. The jersey retirement was similar to Major League Baseball's retirement of the number 42 worn by Jackie Robinson.