(S (S (BASENP (QP (DT Some) (NN 500,000)) (NNS people)) (VP (VP (VP (VP (VBD gathered) (BASENP (NN today))) (PP (IN in) (BASENP (NNP Rome)))) (S (VP (TO to) (VP (VB march) (ADVP (RB silently)))))) (COMMA ,) (S (VP (VBG demanding) (NP (BASENP (DT the) (NN liberation)) (PP (IN of) (NP (BASENP (NNP Giuliana) (NNP Sgrena)) (COMMA ,) (NP (BASENP (DT a) (NN reporter)) (SBAR (WHNP (WP who)) (S (VP (VBD was) (VP (VP (VBN kidnapped) (PP (IN on) (BASENP (NNP February) (NN 4)))) (PP (IN in) (BASENP (NNP Iraq))))))))))))))) (PERIOD .))