( ( ( ( ( ( The ( Carboniferous Period ) ) ( -LRB- ( ( ( ( 345-280 million ) years ) ago ) -RRB- ) ) ) , ) ( known ( for ( its ( great ( coal deposits ) ) ) ) ) ) , ) ( ( witnessed ( ( ( ( ( the development ) ( of reptiles ) ) ( -LRB- ( ( see Reptile ) -RRB- ) ) ) , ) ( ( the ( first animals ) ) ( having ( ( ( an ( amniote egg ) ) , ) ( which ( enables ( the ( embryo ( to ( develop ( on ( dry land ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NNP Carboniferous) (NN Period)) (PRN (-LRB- -LRB-) (ADVP (NP (QP (CD 345-280) (CD million)) (NNS years)) (RB ago)) (-RRB- -RRB-))) (, ,) (VP (VBN known) (PP (IN for) (NP (PRP$ its) (JJ great) (NN coal) (NNS deposits)))) (, ,)) (VP (VBN witnessed) (NP (NP (NP (DT the) (NN development)) (PP (IN of) (NP (NNS reptiles)))) (PRN (-LRB- -LRB-) (S (VP (VB see) (NP (NNP Reptile)))) (-RRB- -RRB-)) (, ,) (NP (NP (DT the) (JJ first) (NNS animals)) (VP (VBG having) (NP (NP (DT an) (JJ amniote) (NN egg)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ enables) (NP (DT the) (NN embryo) (S (VP (TO to) (VP (VB develop) (PP (IN on) (NP (JJ dry) (NN land))))))))))))))) (. .)))
The Carboniferous Period (345-280 million years ago), known for its great coal deposits, witnessed the development of reptiles (see Reptile), the first animals having an amniote egg, which enables the embryo to develop on dry land.
(ROOT (S (NP (DT The) (JJ amniotic) (NN egg)) (ADVP (RB first)) (VP (VBD evolved) (PP (IN in) (NP (NNS reptiles)))) (. .)))