(S (S (BASENP (NNP Sites)) (VP (ADVP (RB later)) (VP (VP (VBD responded) (PP (TO to) (BASENP (DT the) (NN criticism)))) (PP (IN in) (NP (NP (BASENP (DT an) (JJ open) (NN letter)) (PP (TO to) (BASENP (DT the) (NN regiment)))) (PP (IN in) (BASENP (PRPD his) (NN weblog)))))))) (PERIOD .))