( ( This motion ) ( ( must ( be ( used ( to ( turn ( ( the ( car 's ) ) ( ( axle or ) wheels ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN motion)) (VP (MD must) (VP (VB be) (VP (VBN used) (S (VP (TO to) (VP (VB turn) (NP (NP (DT the) (NN car) (POS 's)) (NN axle) (CC or) (NNS wheels)))))))) (. .)))
This motion must be used to turn the car's axle or wheels.
(ROOT (S (NP (DT The) (NN turning) (NN driveshaft)) (VP (VBZ causes) (NP (NP (DT the) (NNS wheels)) (PP (IN of) (NP (DT the) (NN car) (S (VP (TO to) (VP (VB turn)))))))) (. .)))
The turning driveshaft causes the wheels of the car to turn.