little too much maybe
( ( little ( too much ) ) maybe )
(ROOT (FRAG (ADVP (RB little) (RB too) (RB much)) (RB maybe)))
A bit excessive, possibly. 
( ( A bit ) ( ( ( excessive , ) possibly ) . ) )
(ROOT (S (NP (DT A) (NN bit)) (VP (VBD excessive) (, ,) (ADVP (RB possibly))) (. .)))