There's no hint of the action known as curing the Bewereager in the Veterinary Advancement, nor is there any hint of splitting in the code.
In the Libra build, we understand that it is cured with a slowness potion. We also understand that the villager's banner and wolf found in this build are a combination of these two creatures, as is the Bewereager. The Veterinary Advancement mentions splitting it into its components, and the code states that the splitting action results in the creation of a wolf and villager species called "CURED BEWEREAGER." However, we can't figure out how to separate it, either through the code or through the achievement. It's likely that no one else has been able to perform this action yet. Furthermore, there's no information about it on the wiki, your YouTube channel, or the curseforge/modrinth page.

I kindly request your assistance.