Earlier quoted context omitted.
Happened with Dow-Dupont! A three-way split, even (from a two-way merger). Took roughly two years and was the shareholders' plan from the start. By most accounts it went very smoothly. [1] https://www.investors.dupont.com/news-and-media/press-releas... [2] http://www.dow-dupont.com/
Progressive corporate taxation could make it happen for reasons other than dodging the ghosts of chemical sins past!
One doesn't want to create a 'snake sheds its skin' scenario where Meta (for example), stuffs all its liability in a spin-off, yet keeps the profits those actions accrued in the other entity.