( ( When ( arranged ( according ( to ( physical wavelength ) ) ) ) ) ( , ( ( visible light ) ( ( falls ( along ( ( a ( straight line ) ) ( that ( ( moves ( from red ) ) ( to violet ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (VP (VBD arranged) (PP (VBG according) (PP (TO to) (NP (JJ physical) (NN wavelength))))))) (, ,) (NP (JJ visible) (NN light)) (VP (VBZ falls) (PP (IN along) (NP (NP (DT a) (JJ straight) (NN line)) (SBAR (WHNP (WDT that)) (S (VP (VBZ moves) (PP (IN from) (NP (NN red))) (PP (TO to) (NP (NN violet))))))))) (. .)))
When arranged according to physical wavelength, visible light falls along a straight line that moves from red to violet.
(ROOT (S (NP (NN Violet) (CC and) (NN red)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (JJ visible) (NN light))))) (. .)))