(S (S (BASENP (DT The) (NN operation)) (VP (VBD began) (NP (BASENP (DT the) (JJ previous) (NNP Saturday)) (SBAR (WHADVP (WRB when)) (S (BASENP (JJ Pakistani) (NNS forces)) (VP (VBD approached) (PP (IN from) (NP (BASENP (NN three) (JJ separate) (NNS areas)) (PP (IN of) (BASENP (NNP South) (NNP Waziristan))))))))))) (PERIOD .))