(S (S (BASENP (DT The) (NN group)) (VP (VBZ adds) (SBAR (SBAR (IN that) (S (BASENP (PRP it)) (VP (ADVP (RB also)) (VP (VP (VBD conducted) (BASENP (NNS checks))) (PP (IN on) (NP (BASENP (NNP Solo) (NNP International) (NNP Airport)) (CC and) (BASENP (NNP Semarang) (NNP International) (NNP Airport)))))))) (CONJP (COMMA ,) (CC and)) (SBAR (IN that) (S (BASENP (DT these) (NNS airports)) (VP (ADVP (RB also)) (VP (VBD had) (BASENP (JJ invalid) (NNP Airport) (NNP Operating) (NNPS Certificates))))))))) (PERIOD .))