Complex sentence: Five laps later, a second multi-car collision occurred on the frontstretch after Jamie McMurray cut a tire, veered off and collided with Kahne, starting a chain-reaction accident involving Edwards, Stewart, Almirola, Keselowski and Smith.
Split into simpler sentences: Five laps later, a second multi-car collision occurred on the frontstretch after Jamie McMurray cut a tire, veered off, and collided with Kahne. This started a chain-reaction accident involving Edwards, Stewart, Almirola, Keselowski and Smith.