(S (S (PP (PP (IN Under) (BASENP (DT a) (JJ clear) (NN sky))) (CC and) (PP (IN before) (BASENP (DT a) (JJ gentle) (NN sea)))) (COMMA ,) (S (BASENP (DT the) (NN world)) (VP (VBD commemorated) (NP (BASENP (DT those)) (SBAR (S (VP (VP (VBD lost) (BASENP (PRPD their) (NNS lives))) (COMMA ,) (PP (IN in) (NP (BASENP (NN one)) (PP (IN of) (NP (BASENP (DT the) (JJS worst) (JJ natural) (NNS disasters)) (SBAR (WHNP (WDT that)) (S (BASENP (DT the) (JJ modern) (NN world)) (VP (VBZ has) (VP (VBN experienced)))))))))))))))) (PERIOD .))