(S (S (NP (BASENP (NNP Asherman) (POS 's)) (NN syndrome)) (VP (VBZ has) (VP (VBN been) (VP (VBN known) (PP (IN since) (NP (BASENP (NN 1894)) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP it)) (VP (VBD was) (VP (ADVP (RB first)) (VBN reported))))))))))) (PERIOD .))