( ( While ( sunlight ( is ( ( the ( primary cause ) ) ( of ( skin cancer ) ) ) ) ) ) ( , ( ( the ( television reports ) ) ( ( downplayed ( this cause ) ) . ) ) ) )
(ROOT (S (SBAR (IN While) (S (NP (NN sunlight)) (VP (VBZ is) (NP (NP (DT the) (JJ primary) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))))) (, ,) (NP (DT the) (NN television) (NNS reports)) (VP (VBD downplayed) (NP (DT this) (NN cause))) (. .)))
While sunlight is the primary cause of skin cancer, the television reports downplayed this cause.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (VBG leading) (NN cause)) (PP (IN of) (NP (NN skin) (NN cancer))))) (. .)))