( ( The ( human brain ) ) ( ( is ( ( the ( ( most complex ) structure ) ) ( in ( our world ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ human) (NN brain)) (VP (VBZ is) (NP (NP (DT the) (ADJP (RBS most) (JJ complex)) (NN structure)) (PP (IN in) (NP (PRP$ our) (NN world))))) (. .)))
The human brain is the most complex structure in our world.
(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))))) (. .)))