Complex sentence: By complete chance, lap down car Larry Foyt was speeding up to join the lap down line, and Park was T-boned on the drivers side, and the severity of the crash gave him a brain injury as well as several broken ribs.
Split into simpler sentences: By complete chance, lap down car Larry Foyt was speeding up to join the lap down line, and Park was T-boned on the drivers side upon collision with Foyt's car. The severity of the crash gave him a brain injury as well as several broken ribs.