( ( Exposure ( to sunlight ) ) ( ( is ( ( ( ( the ( leading cause ) ) ( of ( skin cancer ) ) ) and ) ( ( premature aging ) ( of ( the skin ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (NN sunlight)))) (VP (VBZ is) (NP (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer)))) (CC and) (NP (NP (JJ premature) (VBG aging)) (PP (IN of) (NP (DT the) (NN skin)))))) (. .)))
Exposure to sunlight is the leading cause of skin cancer and premature aging of the skin.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))) (. .)))