opened it up for all of us to understand 
(ROOT (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 (VP (VBD ) (NP (PRP )) (PRT (RP )) (SBAR (IN ) (S (NP (NP (DT )) (PP (IN ) (NP (PRP )))) (VP (TO ) (VP (VB )))))))