the pathology it pretends to investigate 
(ROOT (NP (NP (DT the) (NN pathology)) (SBAR (S (NP (PRP it)) (VP (VBZ pretends) (S (VP (TO to) (VP (VB investigate)))))))))
(ROOT (NP (NP (DT ) (NN )) (SBAR (S (NP (PRP )) (VP (VBZ ) (S (VP (TO ) (VP (VB )))))))))