( ( Carbohydrate digestion ) ( ( begins ( in ( ( the mouth ) ( due ( to ( ( the action ) ( of ( salivary amylase ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Carbohydrate) (NN digestion)) (VP (VBZ begins) (PP (IN in) (NP (NP (DT the) (NN mouth)) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (NN action)) (PP (IN of) (NP (JJ salivary) (NN amylase))))))))) (. .)))
Carbohydrate digestion begins in the mouth due to the action of salivary amylase.
(ROOT (S (NP (JJ Carbohydrate) (NN digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))