After four years, Clinton has learned how to avoid looking unpresidential.
( ( After ( four years ) ) ( , ( Clinton ( ( has ( learned ( how ( to ( avoid ( looking unpresidential ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN After) (NP (CD four) (NNS years))) (, ,) (NP (NNP Clinton)) (VP (VBZ has) (VP (VBN learned) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB avoid) (S (VP (VBG looking) (NP (NN unpresidential)))))))))) (. .)))
After what seems like forever, Clinton still doesn't understand how avoid looking unpresidential.
( ( After ( what ( seems ( like forever ) ) ) ) ( , ( Clinton ( still ( ( ( does n't ) ( understand ( how ( avoid ( looking unpresidential ) ) ) ) ) . ) ) ) ) )
(ROOT (S (PP (IN After) (SBAR (WHNP (WP what)) (S (VP (VBZ seems) (PP (IN like) (ADVP (RB forever))))))) (, ,) (NP (NNP Clinton)) (ADVP (RB still)) (VP (VBZ does) (RB n't) (VP (VB understand) (SBAR (WHADVP (WRB how)) (S (VP (VBP avoid) (S (VP (VBG looking) (NP (NN unpresidential))))))))) (. .)))