It was like looking into a mirror, except infinitely more realistic.
( It ( ( was ( like ( looking ( into ( ( ( a mirror ) , ) ( except ( infinitely ( more realistic ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (PP (IN like) (S (VP (VBG looking) (PP (IN into) (NP (NP (DT a) (NN mirror)) (, ,) (SBAR (IN except) (S (ADJP (RB infinitely) (RBR more) (JJ realistic)))))))))) (. .)))
It was more realistic than looking in a mirror. 
( It ( ( was ( more ( realistic ( than ( looking ( in ( a mirror ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBD was) (ADJP (RBR more) (JJ realistic) (PP (IN than) (S (VP (VBG looking) (PP (IN in) (NP (DT a) (NN mirror)))))))) (. .)))