( ( The ( Mouth Digestion ) ) ( ( begins ( in ( ( ( the mouth ) , ) ( where ( food ( ( is ( physically ( ( ( broken down ) and ) ( mixed ( with saliva ) ) ) ) ) ( before ( it ( is swallowed ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Mouth) (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (NP (DT the) (NN mouth)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (NN food)) (VP (VBZ is) (ADJP (RB physically) (ADJP (JJ broken) (IN down)) (CC and) (ADJP (JJ mixed) (PP (IN with) (NP (NN saliva))))) (SBAR (IN before) (S (NP (PRP it)) (VP (VBZ is) (VP (VBN swallowed))))))))))) (. .)))
The Mouth Digestion begins in the mouth, where food is physically broken down and mixed with saliva before it is swallowed.
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))