( ( The ( human heart ) ) ( ( is ( composed ( of ( ( ( four chambers ) , ) viz ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ human) (NN heart)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (CD four) (NNS chambers)) (, ,) (NP (NN viz)))))) (. .)))
The human heart is composed of four chambers, viz.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD four) (NNS chambers)) (PP (IN in) (NP (DT the) (NN heart))))) (. .)))