(S (S (PP (BASENP (NN 保護) (NN 当局) (NN 者)) (INP (IN に) (VB よる) (INCON と))) (COMMA 、) (S (SBAR (S (PP-SBJ (NP (PP (BASENP (NN 他)) (IN に)) (BASENP (NN ３３) (NN 頭) (NN 以上))) (IN が)) (VP (PP (BASENP (NN 海)) (IN に)) (VP (ADVP (RB もう一度)) (VP (VP (VBO 浮かべ) (VP (VBV られ))) (VP (MD た)))))) (INCON が)) (COMMA 、) (S (PP-SBJ (NP (NP (PP (BASENP (NN それら)) (IN の)) (NN うち)) (BASENP (NN １５) (NN 頭))) (IN は)) (VP (VBV 死ん) (VP (MD だ)))))) (PERIOD 。))
保護 当局 者 に よる と 、 他 に 33 頭 以上 が 海 に もう一度 浮かべ られ た が 、 それら の うち 15 頭 は 死ん だ 。
Fifteen of them died , although the other 33 were re-floated out to sea , according to a conservation official .