( Digestion ( ( begins ( in ( ( the mouth ) ( with ( ( ( the teeth ) , ) ( which ( ( grind ( the food ) ) ( into ( small particles ) ) ) ) ) ) ) ) ) ; ) )
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (NP (DT the) (NN mouth)) (PP (IN with) (NP (NP (DT the) (NNS teeth)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD grind) (NP (DT the) (NN food)) (PP (IN into) (NP (JJ small) (NNS particles))))))))))) (: ;)))
Digestion begins in the mouth with the teeth, which grind the food into small particles;
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))