( ( ( The ( first reptiles ) ) ( ( produced ( ( leathery ( amniotic eggs ) ) ( that ( could ( be ( laid ( on land ) ) ) ) ) ) ) . ) ) ( Reptiles ( ( were ( the ( first amniotes ) ) ) . ) ) )
(ROOT (S (S (NP (DT The) (JJ first) (NNS reptiles)) (VP (VBD produced) (NP (NP (JJ leathery) (JJ amniotic) (NNS eggs)) (SBAR (WHNP (WDT that)) (S (VP (MD could) (VP (VB be) (VP (VBN laid) (PP (IN on) (NP (NN land)))))))))) (. .)) (NP (NNP Reptiles)) (VP (VBD were) (NP (DT the) (JJ first) (NNS amniotes))) (. .)))
The first reptiles produced leathery amniotic eggs that could be laid on land.  Reptiles were the first amniotes.
(ROOT (S (NP (NNS Mammals)) (VP (VP (VBP have) (NP (CD four) (NNS limbs))) (CC and) (VP (VBP produce) (NP (JJ amniotic) (NNS eggs)))) (. .)))