Complex sentence: Mori gains the upperhand and knocks Snyder to the floor, refusing defeat, Snyder grabs a gun from one of his subbordinates, and is suddenly shot and subdued by Douglas who had arrived just in time.
Split into simpler sentences: Mori gains the upperhand and knocks Snyder to the floor. Refusing defeat, Snyder grabs a gun from one of his subordinates, but is suddenly shot and subdued by Douglas who had arrived just in time.