Complex sentence: Jim finds the renegade in possession of his property, and in the battle that ensues falls under a blow from a shovel wielded by Larsen, who flees from the scene to be swept to his death in an avalanche.
Split into simpler sentences: Jim finds the renegade in possession of his property, and in the battle that ensues, Larsen fells Jim with a blow from a shovel. Larsen flees from the scene and is swept to his death in an avalanche.