( ( ( The center ) ( of ( the atom ) ) ) ( ( ( ( is ( called ( the nucleus ) ) ) and ) ( contains ( the ( ( proton and ) neutron ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN center)) (PP (IN of) (NP (DT the) (NN atom)))) (VP (VP (VBZ is) (VP (VBN called) (NP (DT the) (NN nucleus)))) (CC and) (VP (VBZ contains) (NP (DT the) (NN proton) (CC and) (NN neutron)))) (. .)))
The center of the atom is called the nucleus and contains the proton and neutron.
(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))))) (. .)))