( We ( ( are ( able ( to ( ( see ( visible light ) ) ( because ( ( our eyes ) ( ( are only ) ( sensitive ( to ( visible light ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB see) (NP (JJ visible) (NN light)) (SBAR (IN because) (S (NP (PRP$ our) (NNS eyes)) (VP (VBP are) (ADVP (RB only)) (ADJP (JJ sensitive) (PP (TO to) (NP (JJ visible) (NN light)))))))))))) (. .)))
We are able to see visible light because our eyes are only sensitive to visible light.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (DT the) (JJ only) (NN light)) (SBAR (IN that) (S (NP (NNS people)) (VP (MD can) (VP (VB see) (NP (JJ visible) (NN light))))))) (. .)))