( ( The ( human brain ) ) ( ( is ( ( the ( ( most complex ) ( living organism ) ) ) ( on Earth ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ human) (NN brain)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ complex)) (NN living) (NN organism)) (PP (IN on) (NP (NNP Earth))))) (. .)))
The human brain is the most complex living organism on Earth.
(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))))) (. .)))