it is nearly impossible to look at or understand 
(ROOT (S (NP (PRP it)) (VP (VBZ is) (ADJP (RB nearly) (JJ impossible) (SBAR (S (VP (TO to) (VP (VP (VB look) (PP (IN at))) (CC or) (VP (VB understand))))))))))
(ROOT (S (NP (PRP )) (VP (VBZ ) (ADJP (RB ) (JJ ) (SBAR (S (VP (TO ) (VP (VP (VB ) (PP (IN ))) (CC ) (VP (VB ))))))))))