( ( The ( atoms nucleus ) ) ( ( is ( composed ( of ( ( protons and ) neutrons ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS atoms) (NN nucleus)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NNS protons) (CC and) (NNS neutrons))))) (. .)))
The atoms nucleus is composed of protons and neutrons.
(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))))) (. .)))