( ( Skin melanoma ) ( ( ( does not ) ( appear ( to ( be ( ( a sunlight ) ( caused cancer ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Skin) (NNP melanoma)) (VP (VBZ does) (RB not) (VP (VB appear) (S (VP (TO to) (VP (VB be) (NP (NP (DT a) (NN sunlight)) (VP (VBN caused) (NP (NN cancer))))))))) (. .)))
Skin melanoma does not appear to be a sunlight caused cancer.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))) (. .)))