( ( ( ( Unprotected exposure ) ( to sunlight ) ) ( -LRB- ( ( ultraviolet radiation ) -RRB- ) ) ) ( ( is ( associated ( with ( skin cancer ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (JJ Unprotected) (NN exposure)) (PP (TO to) (NP (NN sunlight)))) (PRN (-LRB- -LRB-) (NP (JJ ultraviolet) (NN radiation)) (-RRB- -RRB-))) (VP (VBZ is) (VP (VBN associated) (PP (IN with) (NP (NN skin) (NN cancer))))) (. .)))
Unprotected exposure to sunlight (ultraviolet radiation) is associated with 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))))))) (. .)))