(SINV (SINV (QT (DQL ``) (QTC (S (S (NP (BASENP (DT The) (NNS theorists) (POS ')) (NNS heads)) (VP (VBD were) (VP (VBG spinning)))) (SBAR (WHADVP (WRB when)) (S (BASENP (PRP they)) (VP (VBD saw) (BASENP (DT the) (NNS data)))))) (COMMA ,)) (DQR '')) (SINV (VP (VBZ adds)) (BASENP (NNP Dr.) (NNP Richardson)))) (PERIOD .))