( ( ( The ( major part ) ) ( of digestion ) ) ( ( takes ( place ( in ( the duodenum ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ major) (NN part)) (PP (IN of) (NP (NN digestion)))) (VP (VBZ takes) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (NN duodenum))))) (. .)))
The major part of digestion 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))))) (. .)))