( ( The nucleus ) ( ( is ( where ( ( ( neutrons and ) protons ) ( are found ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN nucleus)) (VP (VBZ is) (SBAR (WHADVP (WRB where)) (S (NP (NNS neutrons) (CC and) (NNS protons)) (VP (VBP are) (VP (VBN found)))))) (. .)))
The nucleus is where neutrons and protons are found.
(ROOT (S (NP (NNS Protons) (CC and) (NNS neutrons)) (VP (VBP are) (VP (VBN located) (PP (IN in) (NP (DT the) (JJ central) (NN nucleus))))) (. .)))