( ( To ( cause ( to ( ( ( turn ( ( ( on or ) as ) ( on ( its axis ) ) ) ) , ) ( as ( a wheel ) ) ) ) ) ) . )
(ROOT (S (VP (TO To) (VP (VB cause) (S (VP (TO to) (VP (VB turn) (PP (IN on) (CC or) (IN as) (PP (IN on) (NP (PRP$ its) (NNS axis)))) (, ,) (PP (IN as) (NP (DT a) (NN wheel)))))))) (. .)))
To cause to turn on or as on its axis, as 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.