( ( Our digestion ) ( ( begins ( in ( ( ( the mouth ) ( with saliva ) ) ( that ( contains amylase ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Our) (NN digestion)) (VP (VBZ begins) (PP (IN in) (NP (NP (DT the) (NN mouth)) (PP (IN with) (NP (NN saliva))) (SBAR (WHNP (WDT that)) (S (VP (VBZ contains) (ADJP (JJ amylase)))))))) (. .)))
Our digestion begins in the mouth with saliva that contains amylase.
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))