comprehend the chasm of knowledge that 's opened between them 
(ROOT (S (VP (VB comprehend) (NP (NP (NP (DT the) (NN chasm)) (PP (IN of) (NP (NN knowledge)))) (SBAR (WHNP (WDT that)) (S (VP (VBZ 's) (VP (VBN opened) (PP (IN between) (NP (PRP them)))))))))))
(ROOT (S (VP (VB ) (NP (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN )))) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (VP (VBN ) (PP (IN ) (NP (PRP )))))))))))