( ( Our ( breathing centre ) ) ( ( is ( in ( ( ( the ( brain stem ) ) , ) ( ( ( ( the ( lower part ) ) ( of cerebrum ) ) , ) ( the ( thinking brain ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ Our) (NN breathing) (NN centre)) (VP (VBZ is) (PP (IN in) (NP (NP (DT the) (NN brain) (NN stem)) (, ,) (NP (NP (NP (DT the) (JJR lower) (NN part)) (PP (IN of) (NP (NN cerebrum)))) (, ,) (NP (DT the) (VBG thinking) (NN brain)))))) (. .)))
Our breathing centre is in the brain stem, the lower part of cerebrum, the thinking 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))))) (. .)))