( ( Dietary fiber ) ( ( is ( ( the foodstuff ) ( that ( ( is not ) ( digested ( by ( ( ( the stomach ) or ) ( small intestine ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Dietary) (NN fiber)) (VP (VBZ is) (NP (NP (DT the) (NN foodstuff)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (RB not) (VP (VBN digested) (PP (IN by) (NP (NP (DT the) (NN stomach)) (CC or) (NP (JJ small) (NN intestine)))))))))) (. .)))
Dietary fiber is the foodstuff that is not digested by the stomach or small intestine.
(ROOT (S (NP (DT The) (JJ small) (NN intestine)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN stomach)))) (. .)))