( ( ( A ( turtle 's ) ) shell ) ( ( consists ( of ( two layers ) ) ) . ) )
(ROOT (S (NP (NP (DT A) (NN turtle) (POS 's)) (NN shell)) (VP (VBZ consists) (PP (IN of) (NP (CD two) (NNS layers)))) (. .)))
A turtle's shell 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)))) (. .)))