It is difficult to place all the blame on Renfrew, for his editor should have noticed the lack of coherence.
( It ( ( ( ( is ( difficult ( to ( ( place ( all ( the blame ) ) ) ( on Renfrew ) ) ) ) ) , ) ( for ( ( his editor ) ( should ( have ( noticed ( ( the lack ) ( of coherence ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ difficult) (S (VP (TO to) (VP (VB place) (NP (PDT all) (DT the) (NN blame)) (PP (IN on) (NP (NNP Renfrew))))))) (, ,) (SBAR (IN for) (S (NP (PRP$ his) (NN editor)) (VP (MD should) (VP (VB have) (VP (VBN noticed) (NP (NP (DT the) (NN lack)) (PP (IN of) (NP (NN coherence)))))))))) (. .)))
Renfrew is completely to blame.
( Renfrew ( ( is ( completely ( to blame ) ) ) . ) )
(ROOT (S (NP (NNP Renfrew)) (VP (VBZ is) (ADJP (RB completely) (S (VP (TO to) (VP (VB blame)))))) (. .)))