( Disorders ( of ( the ( Nervous System ) ) ) )
(ROOT (NP (NP (NNS Disorders)) (PP (IN of) (NP (DT the) (JJ Nervous) (NN System)))))
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)))))) (. .)))