Complex sentence: Donny runs away as the police show up, while John and Lori at the field, run on the field beside Ted, who in his last breath tells John not to lose Lori again because she is the most important part of his life.
Split into simpler sentences: Donny runs away as the police show up, and John and Lori run on the field beside Ted. With his last breath, Ted tells John not to lose Lori again because she is the most important part of his life.