( ( Exposure ( to ( sunlight ( and ( excessive ( ultraviolet radiation ) ) ) ) ) ) ( ( increases ( ( the risk ) ( for ( skin cancer ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (NN sunlight) (CC and) (JJ excessive) (NN ultraviolet) (NN radiation)))) (VP (VBZ increases) (NP (NP (DT the) (NN risk)) (PP (IN for) (NP (NN skin) (NN cancer))))) (. .)))
Exposure to sunlight and excessive ultraviolet radiation increases the risk for skin cancer.
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (JJ ultraviolet) (NN radiation)))) (VP (MD can) (VP (VP (VB increase) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN pigment)))) (PP (IN in) (NP (DT the) (NN skin)))) (CC and) (VP (VB make) (S (NP (PRP it)) (VP (VB appear) (NP (JJR darker))))))) (. .)))