( ( ( Neutrons and ) protons ) ( ( are ( hadrons ( that ( are ( thought ( to ( be ( composed ( of ( ( three quarks ) each ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Neutrons) (CC and) (NNS protons)) (VP (VBP are) (NP (NP (NNS hadrons)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN thought) (S (VP (TO to) (VP (VB be) (VP (VBN composed) (PP (IN of) (NP (NP (CD three) (NNS quarks)) (NP (DT each)))))))))))))) (. .)))
Neutrons and protons are hadrons that are thought to be composed of three quarks each.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS quarks)) (PP (IN in) (NP (DT each) (NN proton) (CC and) (NN neutron))))) (. .)))