( These ( ( are ( ( areas ( of ( the ( brain stem ) ) ) ) ( that ( control ( awakening ( from ( sleep ( , ( breathing ( , ( and ( heart rate ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP are) (NP (NP (NNS areas)) (PP (IN of) (NP (DT the) (NN brain) (NN stem))) (SBAR (WHNP (WDT that)) (S (VP (VBP control) (S (VP (VBG awakening) (PP (IN from) (NP (NN sleep) (, ,) (NN breathing) (, ,) (CC and) (NN heart) (NN rate)))))))))) (. .)))
These are areas of the brain stem that control awakening from sleep, breathing, and heart rate.
(ROOT (S (NP (DT The) (NN brain) (NN stem)) (VP (VBZ regulates) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN breathing))))) (. .)))