So he goes out and walks in the woods, little dreaming that Mrs. Inglethorp will open his desk, and discover the incriminating document. 
( So ( he ( ( ( ( ( ( ( goes out ) and ) ( ( ( walks ( in ( the woods ) ) ) , ) ( little ( dreaming ( that ( ( Mrs. Inglethorp ) ( will ( open ( his desk ) ) ) ) ) ) ) ) ) , ) and ) ( discover ( the ( incriminating document ) ) ) ) . ) ) )
(ROOT (S (IN So) (NP (PRP he)) (VP (VP (VBZ goes) (PRT (RP out))) (CC and) (VP (VBZ walks) (PP (IN in) (NP (DT the) (NNS woods))) (, ,) (S (VP (ADVP (RB little)) (VBG dreaming) (SBAR (IN that) (S (NP (NNP Mrs.) (NNP Inglethorp)) (VP (MD will) (VP (VB open) (NP (PRP$ his) (NN desk))))))))) (, ,) (CC and) (VP (VBP discover) (NP (DT the) (JJ incriminating) (NN document)))) (. .)))
Taking the incriminating document with him, he walks into the woods.
( ( ( Taking ( the ( incriminating document ) ) ) ( with him ) ) ( , ( he ( ( walks ( into ( the woods ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Taking) (NP (DT the) (JJ incriminating) (NN document)) (PP (IN with) (NP (PRP him))))) (, ,) (NP (PRP he)) (VP (VBZ walks) (PP (IN into) (NP (DT the) (NNS woods)))) (. .)))