( ( reticular formation ) ( ( is ( in ( the midbrain ) ) ) . ) )
(ROOT (S (NP (NN reticular) (NN formation)) (VP (VBZ is) (PP (IN in) (NP (DT the) (NN midbrain)))) (. .)))
reticular formation is in the midbrain.
(ROOT (S (NP (JJ Reticular) (NN formation)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (NN formation)) (SBAR (WHNP (WDT that)) (S (VP (VBZ regulates) (NP (NN sleep) (CC and) (NN arousal))))))))) (. .)))