( ( Most ( of ( ( the ( chemical digestion ) ) ( of food ) ) ) ) ( ( takes ( place ( in ( the duodenum ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (JJ chemical) (NN digestion)) (PP (IN of) (NP (NN food)))))) (VP (VBZ takes) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (NN duodenum))))) (. .)))
Most of the chemical digestion of food takes place in the duodenum.
(ROOT (S (NP (JJS Most) (NNS digestion)) (VP (VBZ is) (VP (VBN completed) (PP (IN in) (NP (DT the) (NN duodenum))))) (. .)))