It is a game that is like fishing in a barrel, but more stimulating mentally.
( It ( ( is ( ( a game ) ( that ( is ( like ( ( ( ( fishing ( in ( a barrel ) ) ) , ) but ) ( more ( stimulating mentally ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (NP (NP (DT a) (NN game)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (PP (IN like) (S (VP (VP (VBG fishing) (PP (IN in) (NP (DT a) (NN barrel)))) (, ,) (CC but) (VP (ADVP (RBR more)) (VBG stimulating) (NP (NNS mentally))))))))))) (. .)))
There are better games than fishing.
( There ( ( are ( ( better games ) ( than fishing ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (JJR better) (NNS games)) (PP (IN than) (NP (NN fishing))))) (. .)))