Complex sentence: Terry detaches the rear section of the train (with the bomb) from the front, but gets into a shootout with the engineer, resulting in the latter falling on the train brakes, causing the train to stop.
Split into simpler sentences: Terry detaches the rear section of the train (with the bomb) from the front, but gets into a shootout with the engineer. The shot engineer falls on the train brakes, causing the train to stop.