( ( The brain ) ( ( stem ( which ( houses ( ( ( ( ( ( ( ( very important ) ( nerve centes ) ) ( such ( as ( those ( for breathing ) ) ) ) ) , ) ( heart rate ) ) , ) and ) ( ( every ( other ( nerve cell ) ) ) ( that ( originates ( from ( the brain ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN brain)) (VP (VBP stem) (SBAR (WHNP (WDT which)) (S (VP (VBZ houses) (NP (NP (NP (ADJP (RB very) (JJ important)) (NN nerve) (NNS centes)) (PP (JJ such) (IN as) (NP (NP (DT those)) (PP (IN for) (NP (NN breathing)))))) (, ,) (NP (NN heart) (NN rate)) (, ,) (CC and) (NP (NP (DT every) (JJ other) (NN nerve) (NN cell)) (SBAR (WHNP (WDT that)) (S (VP (VBZ originates) (PP (IN from) (NP (DT the) (NN brain)))))))))))) (. .)))
The brain stem which houses very important nerve centes such as those for breathing, heart rate, and every other nerve cell that originates from the brain.
(ROOT (S (NP (DT The) (NN brain) (NN stem)) (VP (VBZ regulates) (NP (NP (DT the) (NN rate)) (PP (IN of) (NP (NN breathing))))) (. .)))