Complex sentence: The suspension on Allison's No.15 Ford collapsed as he crossed the finish line on the final lap of the race leading to a smokey victory lap as the car threw sparks but by that time he had already won and was headed to victory lane.
Split into simpler sentences: The suspension on Allison's Number 15 Ford collapsed as he crossed the finish line on the final lap of the race, leading to a smokey victory lap as the car threw sparks. But by that time he had already won and was headed to Victory Lane.