( This ( ( is ( ( ( composed ( of ( two layers ) ) ) and ) ( ( anchors it ) ( to ( the ( surrounding structures ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (VP (VP (VBN composed) (PP (IN of) (NP (CD two) (NNS layers)))) (CC and) (VP (VBN anchors) (NP (PRP it)) (PP (TO to) (NP (DT the) (VBG surrounding) (NNS structures)))))) (. .)))
This is composed of two layers and anchors it to the surrounding structures.
(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)))) (. .)))