( ( A prism ) ( ( can ( be ( used ( to ( show ( that ( ( white light ) ( ( is really ) ( ( a bunch ) ( of ( mixed colors ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN prism)) (VP (MD can) (VP (VB be) (VP (VBN used) (S (VP (TO to) (VP (VB show) (SBAR (IN that) (S (NP (JJ white) (NN light)) (VP (VBZ is) (ADVP (RB really)) (NP (NP (DT a) (NN bunch)) (PP (IN of) (NP (VBN mixed) (NNS colors))))))))))))) (. .)))
A prism can be used to show that white light is really a bunch of mixed colors.
(ROOT (S (NP (DT A) (NN prism)) (VP (VBZ helps) (SBAR (S (NP (NNS people)) (VP (VBP understand) (SBAR (WHNP (WP what)) (S (VP (VBZ makes) (PRT (RP up)) (NP (JJ white) (NN light))))))))) (. .)))
A prism helps people understand what makes up white light.