( Sunglasses ( ( should ( ( block ( ( harmful ( blue ( and ( violet light ) ) ) ) ( in addition ) ) ) ( to ( UV light ) ) ) ) . ) )
(ROOT (S (NP (NNS Sunglasses)) (VP (MD should) (VP (VB block) (NP (NP (JJ harmful) (NN blue) (CC and) (NN violet) (NN light)) (PP (IN in) (NP (NN addition)))) (PP (TO to) (NP (NNP UV) (NN light))))) (. .)))
Sunglasses should block harmful blue and violet light in addition to UV light.
(ROOT (S (NP (DT A) (JJ blue) (NN block)) (VP (VBZ appears) (ADJP (JJ blue) (PP (IN in) (NP (DT the) (NN sunlight)))) (SBAR (IN if) (S (NP (RB only) (JJ blue) (NN light)) (VP (VBZ is) (VP (VBN reflected) (PP (IN by) (NP (DT the) (NN block)))))))) (. .)))