(S (S (NP (BASENP (NNP Nazi) (NNS hunters)) (PRN (COMMA ,) (PP (VBG including) (NP (BASENP (NNS researchers)) (PP (IN from) (BASENP (DT the) (NNP Simon) (NNP Wiesenthal) (NNP Center))))) (COMMA ,))) (VP (VBP have) (VP (VBN been) (VP (VP (VBG looking) (PP (IN for) (BASENP (PRP him)))) (ADVP (RB ever) (RB since)))))) (PERIOD .))