( ( As mentioned ) ( , ( ( ( ( ( ( the ( labyrinthodont vertebrae ) ) ( , ( ( ( ( ( like ( that ( of ( their ( crossopterygian ancestors ) ) ) ) ) , ) and ) ( unlike ( that ( of ( later tetrapods ) ) ) ) ) ( , ( is ( ( made up ) ( of ( several parts ) ) ) ) ) ) ) ) , ) and ) ( ( different ( labyrinthodont lineages ) ) ( evolved ( their ( vertebrae ( different ways ) ) ) ) ) ) . ) ) )
(ROOT (S (SBAR (IN As) (S (VP (VBD mentioned)))) (, ,) (S (NP (DT the) (NN labyrinthodont) (NN vertebrae)) (, ,) (PP (PP (IN like) (NP (NP (DT that)) (PP (IN of) (NP (PRP$ their) (NN crossopterygian) (NNS ancestors))))) (, ,) (CC and) (PP (IN unlike) (NP (NP (DT that)) (PP (IN of) (NP (JJ later) (NNS tetrapods)))))) (, ,) (VP (VBZ is) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (JJ several) (NNS parts)))))) (, ,) (CC and) (S (NP (JJ different) (NN labyrinthodont) (NNS lineages)) (VP (VBD evolved) (NP (PRP$ their) (JJ vertebrae) (JJ different) (NNS ways)))) (. .)))
As mentioned, the labyrinthodont vertebrae, like that of their crossopterygian ancestors, and unlike that of later tetrapods, is made up of several parts, and different labyrinthodont lineages evolved their vertebrae different ways.
(ROOT (S (NP (NNS Caecillians)) (VP (VBD evolved) (PP (IN from) (NP (JJ tetrapod) (NNS ancestors)))) (. .)))