( ( ( ( Amniote tetrapods ) ( -LRB- ( ( ( i.e. , ) ( ( those ( terrestrial vertebrates ) ) ( that ( produce ( eggs ( ( in which ) ( ( the embryo ) ( is ( surrounded ( by ( ( a series ) ( of ( extra-embryonic membranes ) ) ) ) ) ) ) ) ) ) ) ) ) -RRB- ) ) ) ( in ( the ( modern world ) ) ) ) ( ( can ( be ( divided ( into ( ( two ( great lines ) ) ( of ( ( ( ( descent , ) ( the Reptilia ) ) and ) ( the Synapsida ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (JJ Amniote) (NNS tetrapods)) (PRN (-LRB- -LRB-) (NP (NP (NNP i.e.)) (, ,) (NP (NP (DT those) (JJ terrestrial) (NNS vertebrates)) (SBAR (WHNP (WDT that)) (S (VP (VBP produce) (NP (NP (NNS eggs)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT the) (NN embryo)) (VP (VBZ is) (VP (VBN surrounded) (PP (IN by) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (JJ extra-embryonic) (NNS membranes))))))))))))))) (-RRB- -RRB-))) (PP (IN in) (NP (DT the) (JJ modern) (NN world)))) (VP (MD can) (VP (VB be) (VP (VBN divided) (PP (IN into) (NP (NP (CD two) (JJ great) (NNS lines)) (PP (IN of) (NP (NP (NN descent)) (, ,) (NP (DT the) (NNP Reptilia)) (CC and) (NP (DT the) (NNP Synapsida))))))))) (. .)))
Amniote tetrapods (i.e., those terrestrial vertebrates that produce eggs in which the embryo is surrounded by a series of extra-embryonic membranes) in the modern world can be divided into two great lines of descent, the Reptilia and the Synapsida.
(ROOT (S (SBAR (IN Because) (S (NP (PRP$ their) (NNS embryos)) (VP (VBP are) (VP (VBN surrounded) (PP (IN by) (NP (DT a) (JJ thin) (NN membrane))))))) (, ,) (NP (NNS reptiles)) (VP (VBP are) (VP (VBN considered) (NP (NNS amniotes)))) (. .)))