Complex sentence: On the first day of school, the Soul-Skaters and Team X-Bladz race on school grounds and later skater Boomer is seriously injured while Brink and Val are both caught and suspended.
Split into simpler sentences: On the first day of school, the Soul-Skaters and Team X-Bladz race on school grounds. Boomer, a skater for Team X-Bladz, is seriously injured during the race, while Brink and Val are both caught and suspended.