( ( The ( scrotal sac ) ) ( ( consists ( of ( two layers ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ scrotal) (NN sac)) (VP (VBZ consists) (PP (IN of) (NP (CD two) (NNS layers)))) (. .)))
The scrotal sac consists of two layers .
(ROOT (S (NP (NP (DT The) (NN pleura)) (SBAR (WHNP (WDT that)) (S (VP (VBZ surrounds) (NP (DT the) (NNS lungs)))))) (VP (VBZ consists) (PP (IN of) (NP (CD two) (NNS layers)))) (. .)))