( Sunlight ( ( is ( ( the ( major cause ) ) ( of ( skin cancer ) ) ) ) . ) )
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (JJ major) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))) (. .)))
Sunlight is the major cause of skin cancer.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))) (. .)))