Complex sentence: Queensland lungfish ("Neoceratodus fosteri") is an example of an organism that meets this criterion, fossils identical to modern Queensland lungfish have been dated at over 100 million years making this species one of the oldest if not actually the oldest extant vertebrate species.
Split into simpler sentences: Queensland lungfish ("Neoceratodus fosteri") is an example of an organism that meets this criterion. Fossils identical to modern Queensland lungfish have been dated at over 100 million years making this species one of the oldest if not actually the oldest extant vertebrate species.