( One ( ( involves ( ( ( the ( white matter ) ) , ) ( ( the other ) ( the ( gray matter ) ) ) ) ) . ) )
(ROOT (S (NP (PRP One)) (VP (VBZ involves) (NP (NP (DT the) (JJ white) (NN matter)) (, ,) (NP (NP (DT the) (JJ other)) (NP (DT the) (JJ gray) (NN matter))))) (. .)))
One involves the white matter, the other the gray matter.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (DT the) (JJ gray) (NN matter)))) (VP (VBZ is) (PP (IN on) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT the) (NN brain))))) (, ,) (S (VP (VBG surrounding) (NP (JJ white) (NN matter))))) (. .)))