Not exactly the same, but in the 90's we almost split up Microsoft to two separate divisions: a company that builds the operating system, and a company that builds user-space applications.

This was because, during the browser wars of the 90s, Microsoft was purposefully gimping competing browsers at the OS level like Netscape Navigator so as to encourage people to use Internet Explorer.

The textbook case studies would be the break up of Bell Telephone Company [1] or Standard Oil [2].

[1] https://en.wikipedia.org/wiki/Breakup_of_the_Bell_System

[2] https://en.wikipedia.org/wiki/Standard_Oil_Co._of_New_Jersey...