( ( ( ( ( The motor ) , ) ( in turn ) ) , ) ( ( drives ( ( the wheels ) ( of ( the car ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN motor)) (, ,) (PP (IN in) (NP (NN turn))) (, ,)) (VP (VBZ drives) (NP (NP (DT the) (NNS wheels)) (PP (IN of) (NP (DT the) (NN car))))) (. .)))
The motor, in turn, drives the wheels of the car.
(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.