( ( ( increased exposure ) ( to ( ( ultraviolet radiation ) ( due ( to ( ozone thinning ) ) ) ) ) ) ; )
(ROOT (NP (NP (NP (VBN increased) (NN exposure)) (PP (TO to) (NP (NP (JJ ultraviolet) (NN radiation)) (ADJP (JJ due) (PP (TO to) (NP (NN ozone) (NNS thinning))))))) (: ;)))
increased exposure to ultraviolet radiation due to ozone thinning;
(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))))))) (. .)))