(S (S (SBAR (S (PP-SBJ (NP (S-NSBJ (VP (PP-OBJ (SBAR (SBAR (S (PP-SBJ (BASENP (NN 目撃) (NN 者)) (IN が)) (VP (PP-OBJ (BASENP (NN 何)) (IN を)) (VP (VBV 見) (VP (MD た))))) (NN の)) (INFKB か)) (IN を)) (VB 伝える))) (NN の)) (IN は)) (ADJP (ADJP (NN 困難)) (VP (VB すぎる)))) (INCON が)) (CONJP (COMMA 、) (CON しかし)) (S (S-NSBJ (VP (SBAR (S (PP-SBJ (BASENP (NN 何) (INFKB か)) (IN が)) (VP (PP (BASENP (NN そこ)) (IN に)) (VP (VBV 居) (VP (MD た))))) (INQT と)) (VB 述べる))))) (PERIOD 。))
目撃 者 が 何 を 見 た の か を 伝える の は 困難 すぎる が 、 しかし 何 か が そこ に 居 た と 述べる 。
They say that it is too difficult to say what the witnesses saw , but that there was something there .