( ( Digestion ( of starches ) ) ( ( begins ( in ( ( the mouth ) ( with ( ( saliva , ) ( which ( contains ( ( ( the ( digestive ( enzyme ptyalin ) ) ) , ) ( an amylase ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Digestion)) (PP (IN of) (NP (NNS starches)))) (VP (VBZ begins) (PP (IN in) (NP (NP (DT the) (NN mouth)) (PP (IN with) (NP (NP (NN saliva)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ contains) (NP (NP (DT the) (JJ digestive) (NN enzyme) (NN ptyalin)) (, ,) (NP (DT an) (NN amylase))))))))))) (. .)))
Digestion of starches begins in the mouth with saliva, which contains the digestive enzyme ptyalin, an amylase.
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))