bogs down in insignificance , saying nothing about kennedy 's assassination and revealing nothing about the pathology it pretends to investigate 
(ROOT (S (VP (VBZ bogs) (PRT (RP down)) (PP (IN in) (NP (NN insignificance))) (, ,) (S (VP (VP (VBG saying) (NP (NN nothing)) (PP (IN about) (NP (NP (NNP kennedy) (POS 's)) (NN assassination)))) (CC and) (VP (VBG revealing) (NP (NP (NN nothing)) (PP (IN about) (NP (NP (DT the) (NN pathology)) (SBAR (S (NP (PRP it)) (VP (VBZ pretends) (S (VP (TO to) (VP (VB investigate))))))))))))))))
(ROOT (S (VP (VBZ ) (PRT (RP )) (PP (IN ) (NP (NN ))) (, ) (S (VP (VP (VBG ) (NP (NN )) (PP (IN ) (NP (NP (NNP ) (POS )) (NN )))) (CC ) (VP (VBG ) (NP (NP (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (SBAR (S (NP (PRP )) (VP (VBZ ) (S (VP (TO ) (VP (VB ))))))))))))))))