So below is the link for the 2016 FIRST rules on 1 team breaking into two teams.
http://www.usfirst.org/sites/default...es%20Final.pdf
Case 2 looks like it applies to your situation and, if things are as you describe, FIRST wouldn't even approve this maneuver. I think you should get FIRST involved immediately.
If you PM me we can chat privately as our annual Woodie Flowers Award Winner meeting with DR. Murphy and Woodie is fast approaching I would love to bring this up as a topic. This situation seems counter to all that FIRST is trying to achieve.
In any case, talking to administration and FIRST are both next steps I think you should take.
Paul