I want to know the answer to the following question:
Two important Amniotes  lineages became distinct, what was the name of that distinction?
All the background I'm provided with is that "Within a few million years, two important amniote lineages became distinct: the synapsids, which would later include the common ancestor of the mammals; and the sauropsids, which would eventually come to include turtles, lizards, snakes, crocodilians, dinosaurs and birds.". Is that enough to answer the question?
Answer: yes