( It ( ( consists ( of ( ( ( the ( ( sympathetic nervous ) system ) ) and ) ( the ( ( parasympathetic nervous ) system ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ consists) (PP (IN of) (NP (NP (DT the) (ADJP (JJ sympathetic) (JJ nervous)) (NN system)) (CC and) (NP (DT the) (ADJP (JJ parasympathetic) (JJ nervous)) (NN system))))) (. .)))
It consists of the  sympathetic nervous system and the parasympathetic nervous system.
(ROOT (S (NP (DT The) (JJ parasympathetic) (NN system)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (VP (VBN referred) (S (VP (TO to))) (PP (IN as) (NP (DT the) (JJ craniosacral) (NN system)))))) (. .)))