( Humans ( ( ( are only ) ( able ( to ( see ( ( ( ( ( ( a ( small portion ) ) ( of ( ( this radiation ) called ) ) ) , ) appropriately ) , ) ( visible light ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Humans)) (VP (VBP are) (ADVP (RB only)) (ADJP (JJ able) (S (VP (TO to) (VP (VB see) (NP (NP (DT a) (JJ small) (NN portion)) (PP (IN of) (NP (NP (DT this) (NN radiation)) (VP (VBN called)))) (, ,) (ADVP (RB appropriately)) (, ,) (ADJP (JJ visible) (JJ light)))))))) (. .)))
Humans are only able to see a small portion of this radiation called, appropriately, 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))))))) (. .)))