fessenden has nurtured his metaphors at the expense of his narrative 
(ROOT (S (NP (NNP fessenden)) (VP (VBZ has) (VP (VBN nurtured) (NP (PRP$ his) (NNS metaphors)) (PP (IN at) (NP (NP (DT the) (NN expense)) (PP (IN of) (NP (PRP$ his) (NN narrative)))))))))
(ROOT (S (NP (NNP )) (VP (VBZ ) (VP (VBN ) (NP (PRP$ ) (NNS )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (PRP$ ) (NN )))))))))