( ( As ( ( the brain ) deteriorates ) ) ( , ( so ( ( does ( its ( ability ( to ( control ( body ( ( parts and ) functions ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (DT the) (NN brain)) (VP (VBZ deteriorates)))) (, ,) (RB so) (VP (VBZ does) (NP (PRP$ its) (NN ability) (S (VP (TO to) (VP (VB control) (NP (NN body) (NNS parts) (CC and) (NNS functions))))))) (. .)))
As the brain deteriorates, so does its ability to control body parts and functions.
(ROOT (S (ADVP (RB Not) (RB surprisingly)) (, ,) (NP (JJ controlling) (NN flight)) (VP (VBZ is) (NP (NP (DT the) (NN function)) (PP (IN of) (NP (NP (DT the) (ADJP (RBS most) (JJ developed)) (NN part)) (PP (IN of) (NP (NP (DT a) (NN bird) (POS 's)) (NN brain))))))) (. .)))