( ( ( ( ( Once attached ) ( , ( ( his ( digestive organs ) ) degenerate ) ) ) and ) ( ( the ( lip ( and ( mouth tissues ) ) ) ) ( begin ( to ( fuse ( with ( ( the body ) ( of ( the female ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (SBAR (IN Once) (S (VP (VBN attached)))) (, ,) (NP (PRP$ his) (JJ digestive) (NNS organs)) (VP (VB degenerate))) (CC and) (S (NP (DT the) (NN lip) (CC and) (NN mouth) (NNS tissues)) (VP (VBP begin) (S (VP (TO to) (VP (VB fuse) (PP (IN with) (NP (NP (DT the) (NN body)) (PP (IN of) (NP (DT the) (NN female)))))))))) (. .)))
Once attached, his digestive organs degenerate and the lip and mouth tissues begin to fuse with the body of the female.
(ROOT (S (NP (JJ Carbohydrate) (NN digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN mouth)))) (. .)))