Complex sentence: The 400 was never intended as a high-performance engine and never saw large factory horsepower numbers; however, it did develop a reputation for creating a tremendous amount of torque and has since become popular for many types of racing, both on and off road.
Split into simpler sentences: The 400 was never intended as a high-performance engine and never saw large factory horsepower numbers; however, it did develop a reputation for creating a tremendous amount of torque. It has since become popular for many types of racing, both on and off road.