unmerge
/ˌʌnˈmɜːrdʒ/Definitions
1. verb
to cause (something) to come apart or separate again, after having been united or combined
“The unmerging of the companies was a complex process that took months to complete.”
2. verb
to remove or separate something from a larger whole or system
“The software unmerged the user data from the old server to the new one.”
3. verb
to undo or reverse the act of merging something
“The new management decided to unmerge the departments and go back to the original structure.”
4. noun
the act of causing (something) to come apart or separate again
“The unmerging of the companies was a major issue in the merger agreement.”