( ( ( ( ( The ( second organ ) ) , ) ( the ( pituitary gland ) ) ) , ) ( ( sits ( at ( ( the base ) ( of ( the brain ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ second) (NN organ)) (, ,) (NP (DT the) (JJ pituitary) (NN gland)) (, ,)) (VP (VBZ sits) (PP (IN at) (NP (NP (DT the) (NN base)) (PP (IN of) (NP (DT the) (NN brain)))))) (. .)))
The second organ, the pituitary gland, sits at the base of the brain.
(ROOT (S (NP (DT The) (JJ pituitary) (NN gland)) (VP (VBZ is) (PP (IN in) (NP (DT the) (NN brain)))) (. .)))