( ( By ( ( cutting back ) ( on ( simple carbohydrates ) ) ) ) ( , ( ( ( the rate ) ( of ( dental caries ) ) ) ( ( can ( be reduced ) ) . ) ) ) )
(ROOT (S (PP (IN By) (S (VP (VBG cutting) (PRT (RP back)) (PP (IN on) (NP (JJ simple) (NNS carbohydrates)))))) (, ,) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (JJ dental) (NNS caries)))) (VP (MD can) (VP (VB be) (VP (VBN reduced)))) (. .)))
By cutting back on simple carbohydrates, the rate of dental caries can be reduced.
(ROOT (S (NP (NN Simple) (NNS carbohydrates)) (VP (MD can) (VP (VB be) (VP (VBN classified) (PP (IN in) (NP (NP (NNS terms)) (PP (IN of) (NP (NN chain) (NN length)))))))) (. .)))