(S (S (S (BASENP (DT The) (NN two) (NNS ships)) (VP (VBD were) (VP (VBG carrying) (NP (BASENP (DT a) (NN total)) (PP (IN of) (NP (BASENP (QP (RB around) (NN 7,150)) (NNS tons)) (PP (IN of) (BASENP (NN sulfur))))))))) (COMMA ,) (PP (VBG according) (PP (TO to) (NP (BASENP (NNP Sergei) (NNP Petrov)) (COMMA ,) (NP (NP (BASENP (NNP Russia) (POS 's)) (NP (BASENP (NNP Ministry)) (PP (IN of) (BASENP (NNP Emergency) (NNPS Situations))))) (BASENP (JJ regional) (NN spokesperson))))))) (PERIOD .))