( ( ( The lungs ) ( are ( surrounded ( by ( ( two layers ) ( of ( serous ( -LRB- ( ( watery producing ) -RRB- ) ) ) ) ) ) ) ) ) ( membranes ( ( called ( pleural membranes ) ) . ) ) )
(ROOT (S (S (NP (DT The) (NNS lungs)) (VP (VBP are) (VP (VBN surrounded) (PP (IN by) (NP (NP (CD two) (NNS layers)) (PP (IN of) (NP (NP (NNS serous)) (PRN (-LRB- -LRB-) (NP (JJ watery) (NN producing)) (-RRB- -RRB-))))))))) (NP (NNS membranes)) (VP (VBD called) (NP (JJ pleural) (NNS membranes))) (. .)))
The lungs are surrounded by two layers of serous (watery producing) membranes called pleural membranes .
(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)))) (. .)))