( ( ( degenerative disorders ) ( of ( the ( nervous system ) ) ) ) ; )
(ROOT (NP (NP (JJ degenerative) (NNS disorders)) (PP (IN of) (NP (DT the) (JJ nervous) (NN system))) (: ;)))
degenerative disorders of the nervous system;
(ROOT (S (NP (JJ Neurodevelopmental) (NNS disorders)) (VP (VBP happen) (SBAR (WHADVP (WRB when)) (S (NP (NP (NN development)) (PP (IN of) (NP (JJ nervous) (NN system)))) (VP (VBZ is) (ADJP (JJ disturbed)))))) (. .)))