( ( For ( this reason ) ) ( ( the ( parasympathetic system ) ) ( ( ( is sometimes ) ( called ( the ( craniosacral system ) ) ) ) . ) ) )
(ROOT (S (PP (IN For) (NP (DT this) (NN reason))) (NP (DT the) (JJ parasympathetic) (NN system)) (VP (VBZ is) (ADVP (RB sometimes)) (VP (VBN called) (NP (DT the) (JJ craniosacral) (NN system)))) (. .)))
For this reason the parasympathetic system is sometimes called the craniosacral 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)))))) (. .)))