( Volume ( , ( ( ( is ( the space ) ) ( that ( matter ( takes up ) ) ) ) . ) ) )
(ROOT (S (NP (NN Volume)) (, ,) (VP (VBZ is) (NP (DT the) (NN space)) (SBAR (IN that) (S (NP (NN matter)) (VP (VBZ takes) (PRT (RP up)))))) (. .)))
Volume, is the space that matter takes up.
(ROOT (S (NP (DT The) (NN term) (NN volume)) (VP (VBZ means) (SBAR (S (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN space) (NN matter)))) (VP (VBZ takes) (PRT (RP up)))))) (. .)))