( ( ( ( ( ( A unit ) ( of pressure ) ) , ) ( the torr ) ) , ) ( ( is ( named ( for Torricelli ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT A) (NN unit)) (PP (IN of) (NP (NN pressure)))) (, ,) (NP (DT the) (NN torr)) (, ,)) (VP (VBZ is) (VP (VBN named) (PP (IN for) (NP (NNP Torricelli))))) (. .)))
A unit of pressure, the torr, is named for Torricelli.
(ROOT (S (NP (DT A) (NN torr)) (VP (VBZ is) (NP (NP (DT a) (NN unit)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN pressure)))))))) (. .)))
A torr is a unit used to measure pressure.