( Digestion ( ( begins ( in ( ( the mouth ) ( where ( ( salivary amylase ) ( starts ( ( the breakdown ) ( of carbohydrates ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (NP (DT the) (NN mouth)) (SBAR (WHADVP (WRB where)) (S (NP (JJ salivary) (NN amylase)) (VP (VBZ starts) (NP (NP (DT the) (NN breakdown)) (PP (IN of) (NP (NNS carbohydrates)))))))))) (. .)))
Digestion begins in the mouth where salivary amylase starts the breakdown of carbohydrates.
(ROOT (S (NP (JJ Carbohydrate) (NN digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))