(S (S (BASENP (NNP Richard)) (VP (VBZ is) (NP (BASENP (DT the) (JJ only) (NN person)) (SBAR (S (VP (TO to) (VP (VB have) (VP (VBN completed) (BASENP (NN six) (JJ full) (NNP North) (NNP Pole) (NNS expeditions)))))))))) (PERIOD .))