(S (S (BASENP (PRP It)) (VP (VBZ is) (VP (VBN thought) (SBAR (IN that) (S (BASENP (DT the) (NN man)) (VP (VP (VBD stole) (BASENP (DT the) (NN key))) (PP (IN from) (NP (BASENP (DT an) (NN officer)) (PP (IN at) (BASENP (DT the) (NN station))))))))))) (PERIOD .))