Hughes has accomplished this in part by the unusual technique of double ghosting.
( Hughes ( ( has ( ( accomplished ( this ( in part ) ) ) ( by ( ( the ( unusual technique ) ) ( of ( double ghosting ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Hughes)) (VP (VBZ has) (VP (VBN accomplished) (NP (NP (DT this)) (PP (IN in) (NP (NN part)))) (PP (IN by) (NP (NP (DT the) (JJ unusual) (NN technique)) (PP (IN of) (NP (JJ double) (NN ghosting))))))) (. .)))
He was not able to ghost.
( He ( ( ( was not ) ( able ( to ghost ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD was) (RB not) (ADJP (JJ able) (PP (TO to) (NP (NN ghost))))) (. .)))