( as ( , ( ( ( the turn ) ( of ( a wheel ) ) ) . ) ) )
(ROOT (X (ADVP (IN as)) (, ,) (NP (NP (DT the) (NN turn)) (PP (IN of) (NP (DT a) (NN wheel)))) (. .)))
as, the turn of a wheel .
(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.