(S (S (BASENP (PRP He)) (VP (VP (VBZ takes) (BASENP (NN office))) (PP (IN at) (NP (BASENP (DT a) (NN time)) (SBAR (WHADVP (WRB when)) (S (BASENP (NNP NASA)) (VP (VBZ is) (ADJP (JJ busy) (PP (IN with) (NP (BASENP (NNS preparations)) (PP (IN for) (NP (NP (BASENP (DT the) (NN return)) (PP (TO to) (NP (BASENP (NN flight)) (PP (IN of) (BASENP (DT the) (NN space) (NN shuttle) (NNP Discovery)))))) (COMMA ,) (VP (VBN expected) (ADVP (ADVP (RB sometime)) (PP (IN during) (NP (BASENP (DT the) (NN launch) (NN window)) (PP (IN of) (NP (NP (BASENP (NNP May) (NN 15)) (CC through) (BASENP (NNP June) (NN 3))) (COMMA ,) (BASENP (NN 2005)))))))))))))))))))) (PERIOD .))