Complex sentence: The second marshal, Fredrik Jansen van Vuuren, was hit by the car of Tom Pryce and killed instantly by the collision; the fire extinguisher he was holding flew from his hands and hit Pryce in the face, killing and nearly decapitating him.
Split into simpler sentences: The second marshal, Fredrik Jansen van Vuuren, was hit by the car of Tom Pryce and killed instantly by the collision. The fire extinguisher van Vuuren was holding flew from his hands, and hit Pryce in the face, killing and nearly decapitating him.