( ( ( The ( motor cortex ) ) ( within ( ( the ( cerebral cortex ) ) ( of ( the brain ) ) ) ) ) ( ( is ( known ( to ( ( control ( voluntary respiration ) ) ( because ( ( the ( motor cortex ) ) ( controls ( voluntary ( muscle movement ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN motor) (NN cortex)) (PP (IN within) (NP (NP (DT the) (JJ cerebral) (NN cortex)) (PP (IN of) (NP (DT the) (NN brain)))))) (VP (VBZ is) (VP (VBN known) (S (VP (TO to) (VP (VB control) (NP (JJ voluntary) (NN respiration)) (SBAR (IN because) (S (NP (DT the) (NN motor) (NN cortex)) (VP (VBZ controls) (NP (JJ voluntary) (NN muscle) (NN movement)))))))))) (. .)))
The motor cortex within the cerebral cortex of the brain is known to control voluntary respiration because the motor cortex controls voluntary muscle movement.
(ROOT (S (NP (JJ Muscle) (NNS groups)) (VP (VBP are) (VP (VBN controlled) (PP (IN by) (NP (DT the) (NN motor) (NN cortex))))) (. .)))