( ( This ( blue light ) ) ( ( ( is ( difficult ( for ( the ( human eye ) ) ) ) ) ( to ( focus ( due ( to ( its ( scattering characteristics ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (JJ blue) (NN light)) (VP (VBZ is) (ADJP (JJ difficult) (PP (IN for) (NP (DT the) (JJ human) (NN eye)))) (S (VP (TO to) (VP (VB focus) (ADJP (JJ due) (PP (TO to) (NP (PRP$ its) (VBG scattering) (NNS characteristics)))))))) (. .)))
This blue light is difficult for the human eye to focus due to its scattering characteristics.
(ROOT (S (NP (DT A) (JJ human) (NN offspring)) (VP (VBP inherit) (NP (JJ blue) (NNS eyes))) (. .)))