( ( ( ( ( They ( do ( have ( ( ( 4 stomachs ) , ) ( needed ( to ( digest ( the grass ) ) ) ) ) ) ) ) , ) and ) ( ( the ( first stomach ) ) ( can ( ( return ( the food ) ) ( to ( ( the mouth ) ( for ( a ( 2nd ( grinding session ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VBP do) (VP (VB have) (NP (NP (CD 4) (NNS stomachs)) (, ,) (VP (VBN needed) (S (VP (TO to) (VP (VB digest) (NP (DT the) (NN grass)))))))))) (, ,) (CC and) (S (NP (DT the) (JJ first) (NN stomach)) (VP (MD can) (VP (VB return) (NP (DT the) (NN food)) (PP (TO to) (NP (NP (DT the) (NN mouth)) (PP (IN for) (NP (DT a) (JJ 2nd) (VBG grinding) (NN session)))))))) (. .)))
They do have 4 stomachs, needed to digest the grass, and the first stomach can return the food to the mouth for a 2nd grinding session.
(ROOT (S (NP (DT The) (NN mouth)) (VP (VBZ is) (NP (DT the) (JJ first) (NN digestive) (NN organ)) (SBAR (IN that) (S (NP (NN food)) (VP (VBZ enters))))) (. .)))