( ( ( The ( slow pace ) ) ( of change ) ) ( ( can ( be discouraging ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ slow) (NN pace)) (PP (IN of) (NP (NN change)))) (VP (MD can) (VP (VB be) (ADJP (JJ discouraging)))) (. .)))
The slow pace of change can be discouraging.
(ROOT (S (NP (NNP Human) (NN evolution)) (VP (VBZ shows) (SBAR (IN that) (S (NP (JJ evolutionary) (NNS changes)) (ADVP (RB typically)) (VP (VBP occur) (PP (IN at) (NP (DT a) (JJ slow) (NN pace))))))) (. .)))