(S (S (BASENP (NNP Tony) (NNP Abbott)) (VP (VP (VP (VBD became) (NP (BASENP (NN leader)) (PP (IN of) (NP (BASENP (DT the) (NNP Liberal) (NNP Party)) (PP (IN of) (BASENP (NNP Australia))))))) (PP (IN in) (BASENP (NNP December) (NN 2009)))) (S (VP (VBG replacing) (NP (BASENP (NNP Malcolm) (NNP Turnbull)) (COMMA ,) (SBAR (WHNP (WP who)) (S (VP (VBD had) (VP (VP (VBN replaced) (BASENP (NNP Brendan) (NNP Nelson))) (ADVP (BASENP (NN two) (NNS years)) (RB previously))))))))))) (PERIOD .))