cox offers plenty of glimpses at existing photos , 
(ROOT (S (NP (NNP cox)) (VP (VBZ offers) (NP (NP (NN plenty)) (PP (IN of) (NP (NP (NNS glimpses)) (PP (IN at) (NP (VBG existing) (NNS photos))))))) (, ,)))
(ROOT (S (NP (NNP )) (VP (VBZ ) (NP (NP (NN )) (PP (IN ) (NP (NP (NNS )) (PP (IN ) (NP (VBG ) (NNS ))))))) (, )))