Complex sentence: According to the Center for Injury Research and Policy at Nationwide Children's Hospital, the biggest risk for youth sports is death or serious injury including concussion, with the highest risk coming from running, basketball, football, volleyball, soccer, and gymnastics.
Split into simpler sentences: According to the Center for Injury Research and Policy at Nationwide Children's Hospital, the biggest risk for youth sports is death or serious injury including concussion. These risks come from running, basketball, football, volleyball, soccer, and gymnastics.