The costs to separate the spinco itself might be more that the value of shares they are getting, in terms of all systems that need to be extricated out of common CS processes and plugged into vantiva.
Vantiva total mcap is 56mil Euro , so 25% of Vantiva at current price is less than 15million Euros
https://www.telecomtv.com/content/access-evolution/commscope-finally-offloads-its-problem-child-48618/