( ( ( ( ( The brain ) , ) ( ( the ( body 's ) ) ( ( most ( ( vital and ) complex ) ) organ ) ) ) , ) ( ( matures ( outside ( of ( the womb ) ) ) ) ; ) )
(ROOT (S (NP (NP (DT The) (NN brain)) (, ,) (NP (NP (DT the) (NN body) (POS 's)) (ADJP (RBS most) (JJ vital) (CC and) (JJ complex)) (NN organ)) (, ,)) (VP (VBZ matures) (NP (NP (RB outside)) (PP (IN of) (NP (DT the) (NN womb))))) (: ;)))
The brain, the body's most vital and complex organ, matures outside of the womb;
(ROOT (S (NP (DT The) (NN brain)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ complex)) (NN organ)) (PP (IN in) (NP (DT the) (JJ human) (NN body))))) (. .)))