( ( The animals ) ( slowly ( ( ( starve ( to death ) ) ( as ( they ( ( ( ( ( digest ( their ( internal organs ) ) ) and ) ( shrink ( until ( they ( ( can ( no longer ) ) ( sustain themselves ) ) ) ) ) ) and ) perish ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNS animals)) (ADVP (RB slowly)) (VP (VBP starve) (PP (TO to) (NP (NN death))) (SBAR (IN as) (S (NP (PRP they)) (VP (VP (VB digest) (NP (PRP$ their) (JJ internal) (NNS organs))) (CC and) (VP (VB shrink) (SBAR (IN until) (S (NP (PRP they)) (VP (MD can) (ADVP (RB no) (RB longer)) (VP (VB sustain) (NP (PRP themselves))))))) (CC and) (VP (VB perish)))))) (. .)))
The animals slowly starve to death as they digest their internal organs and shrink until they can no longer sustain themselves and perish.
(ROOT (S (NP (NNS Animals)) (VP (VBP engage) (PP (IN in) (NP (JJ internal) (NN digestion)))) (. .)))