(S (S (S (BASENP (NN Airport) (NNS workers)) (VP (VBD found) (BASENP (DT the) (NN boy)))) (SBAR (IN after) (S (BASENP (DT the) (NN plane)) (VP (VBD had) (VP (VBN landed) (PP (IN at) (BASENP (NNP Moscow)))))))) (PERIOD .))