(S (S (PP (IN Upon) (BASENP (PRPD its) (NN return))) (COMMA ,) (S (S (BASENP (DT the) (NN plane)) (VP (VBD landed) (PP (IN in) (BASENP (NNP Kabul))))) (SBAR (IN after) (S (BASENP (PRP it)) (VP (VBD encountered) (BASENP (JJ high) (NNS winds))))))) (PERIOD .))