(S (S (BASENP (PRP He)) (VP (VBZ believes) (SBAR (S (BASENP (PRP it)) (VP (VP (MD could) (VP (VB take) (BASENP (NNS years)))) (SBAR (IN for) (S (BASENP (DT the) (NNPS Monarchs)) (VP (TO to) (VP (VB repopulate)))))))))) (PERIOD .))