(S (S (S (BASENP (PRP It)) (VP (VP (VBD was) (VP (ADVP (RB then)) (VP (VBN delayed) (PP (IN until) (BASENP (NNP February) (NN 27)))))) (CONJP (COMMA ,) (CC but)) (VP (VBD was) (VP (ADVP (RB then)) (VP (VP (VBN delayed) (ADVP (RB indefinitely))) (PP (IN on) (BASENP (NNP February) (NN 20)))))))) (SBAR (IN after) (S (BASENP (NNP NASA)) (VP (VBD discovered) (NP (BASENP (DT an) (NN issue)) (PP (IN with) (BASENP (DT the) (NN hydrogen) (NN control) (NNS valves)))))))) (PERIOD .))