the bai brothers have taken an small slice of history and opened it up for all of us to understand 
(ROOT (S (NP (DT the) (NN bai) (NNS brothers)) (VP (VBP have) (VP (VP (VBN taken) (NP (NP (DT an) (JJ small) (NN slice)) (PP (IN of) (NP (NN history))))) (CC and) (VP (VBD opened) (NP (PRP it)) (PRT (RP up)) (SBAR (IN for) (S (NP (NP (DT all)) (PP (IN of) (NP (PRP us)))) (VP (TO to) (VP (VB understand))))))))))
(ROOT (S (NP (DT ) (NN ) (NNS )) (VP (VBP ) (VP (VP (VBN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (NN ))))) (CC ) (VP (VBD ) (NP (PRP )) (PRT (RP )) (SBAR (IN ) (S (NP (NP (DT )) (PP (IN ) (NP (PRP )))) (VP (TO ) (VP (VB ))))))))))