(S (S (PP (IN In) (BASENP (NNP May) (NN 2006))) (S (BASENP (PRP it)) (VP (VP (VBD increased) (ADVP (RB dramatically))) (S (VP (VP (VP (VBG culminating) (PRT (RP in))) (BASENP (JJ violent) (NNS eruptions))) (PP (IN on) (NP (BASENP (NNP July) (NN 14)) (CC and) (BASENP (NNP August) (NN 16))))))))) (PERIOD .))