(S (S (BASENP (ADJP (RB Recently) (VBN declassified)) (NNS letters)) (VP (VBP prove) (SBAR (IN that) (S (BASENP (NNP Wood)) (VP (VP (VP (VBD raised) (BASENP (DT these) (NNS concerns))) (ADVP (RB directly))) (PP (IN with) (BASENP (NNP Jack) (NNP Straw)))))))) (PERIOD .))