Original sentence: The terms sabre-toothed cat, sabretooth, and sabre-toothed tiger describe numerous species, mainly in the families Felidae (subfamily Machairodontinae), Barbourofelidae, and Nimravidae, but also including two marsupial families, that lived during various parts of the Cenozoic Era and evolved their sabre-toothed characteristics entirely independently
Edited sentence: Barbourofelidae entered around 16.9 mya and were extinct by 9 mya.Sabre-toothed cat refers to extinct subfamilys of Machairodontinae (Felidae), Barbourofelidae (Feliformia), and Nimravidae (Feliformia) as well as two marsupial families that were found worldwide from the Eocene-Pleistocene epochs (42 mya—11,000 years ago), existing for approximately.The Nimravidae are the oldest entering the landscape around 42 mya and becoming extinct by 7.2 mya.These subfamilies evolved their sabre-toothed characteristics entirely independently.These two would have shared some habitats