(S (S (NP (BASENP (NNP George) (NNP W.) (NNP Bush)) (COMMA ,) (NP (BASENP (DT the) (NN president)) (PP (IN of) (BASENP (DT the) (NNP United) (NNPS States))))) (VP (VBZ has) (VP (VBN visited) (NP (BASENP (NNP Tennessee)) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (VBN hit) (PP (IN by) (NP (BASENP (QP (RB over) (NN 25)) (NNS tornadoes)) (SBAR (WHNP (WDT which)) (S (VP (VBD caused) (BASENP (QP (RB over) (NN 33)) (NNS deaths))))))))))))))) (PERIOD .))