( ( Exposure ( to ( the sun ) ) ) ( ( s ( ( ultraviolet radiation ) ( significantly ( increases ( ( the risk ) ( of ( skin cancer ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (DT the) (NN sun)))) (VP (VBZ s) (NP (NP (JJ ultraviolet) (NN radiation)) (SBAR (S (VP (ADVP (RB significantly)) (VBZ increases) (NP (NP (DT the) (NN risk)) (PP (IN of) (NP (NN skin) (NN cancer))))))))) (. .)))
Exposure to the sun s ultraviolet radiation significantly increases the risk of 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))))))) (. .)))