( ( Wolfgang Pauli ) ( first ( ( ( proposed ( ( the existence ) ( of ( ( the neutrino ) ( in 1930 ) ) ) ) ) ( to ( ( explain ( ( an ( apparent nonconservation ) ) ( of energy ) ) ) ( when ( ( radioactive particles ) decayed ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNP Wolfgang) (NNP Pauli)) (ADVP (RB first)) (VP (VBD proposed) (NP (NP (DT the) (NN existence)) (PP (IN of) (NP (NP (DT the) (NN neutrino)) (PP (IN in) (NP (CD 1930)))))) (S (VP (TO to) (VP (VB explain) (NP (NP (DT an) (JJ apparent) (NN nonconservation)) (PP (IN of) (NP (NN energy)))) (SBAR (WHADVP (WRB when)) (S (NP (JJ radioactive) (NNS particles)) (VP (VBD decayed)))))))) (. .)))
Wolfgang Pauli first proposed the existence of the neutrino in 1930 to explain an apparent nonconservation of energy when radioactive particles decayed.
(ROOT (S (NP (JJ Radioactive) (NN decay)) (VP (MD can) (VP (VB give) (PRT (RP off)) (NP (NN energy) (CC and) (NNS particles)))) (. .)))