( ( Joint play ) ( ( can ( be ( simply ( defined ( as ( ( that motion ) ( of ( ( a ( synovial joint ) ) ( that ( ( can not ) ( be ( produced ( by ( voluntary movement ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Joint) (NN play)) (VP (MD can) (VP (VB be) (VP (ADVP (RB simply)) (VBN defined) (PP (IN as) (NP (NP (DT that) (NN motion)) (PP (IN of) (NP (NP (DT a) (JJ synovial) (NN joint)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (RB not) (VP (VB be) (VP (VBN produced) (PP (IN by) (NP (JJ voluntary) (NN movement))))))))))))))) (. .)))
Joint play can be simply defined as that motion of a synovial joint that cannot be produced by voluntary movement.
(ROOT (S (NP (NNP Motion)) (VP (MD can) (VP (VB be) (VP (VBN defined) (ADVP (RB simply)) (PP (IN as) (NP (NP (DT a) (NN change)) (PP (IN in) (NP (NN position)))))))) (. .)))