( ( The atom ) ( ( is ( composed ( of ( ( a ( heavy nucleus ) ) ( consisting ( of ( ( neutrons and ) protons ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN atom)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (DT a) (JJ heavy) (NN nucleus)) (VP (VBG consisting) (PP (IN of) (NP (NNS neutrons) (CC and) (NNS protons)))))))) (. .)))
The atom is composed of a heavy nucleus consisting of neutrons and protons.
(ROOT (S (NP (NP (DT The) (NN atom)) (PP (IN in) (NP (DT a) (NN neutron)))) (VP (VBZ is) (VP (VBN found) (PP (IN in) (NP (DT the) (DT the) (NN nucleus))))) (. .)))