( ( Sunlight ( -LRB- ( ( ultraviolet light ) -RRB- ) ) ) ( ( is ( ( the ( chief cause ) ) ( of ( ( all ( skin cancers ) ) ( including melanomas ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Sunlight)) (PRN (-LRB- -LRB-) (NP (JJ ultraviolet) (NN light)) (-RRB- -RRB-))) (VP (VBZ is) (NP (NP (DT the) (JJ chief) (NN cause)) (PP (IN of) (NP (NP (DT all) (NN skin) (NNS cancers)) (PP (VBG including) (NP (NNS melanomas))))))) (. .)))
Sunlight (ultraviolet light) is the chief cause of all skin cancers including melanomas.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))) (. .)))