Hey guys, I'm about to complete my PhD thesis, but I'm unsure of the best way to write my acknowledgement section as my situation is quite complicated:

My original principal supervisor left the university (but he is still listed as an external co-supervisor), so my co-supervisor became my principal supervisor for a while before the university said she can no-longer be my principal supervisor due to some university rules and policies, so she became my co-supervisor again. Then I had another principal supervisor (current) assigned (who had been my other co-supervisor since the first principal supervisor left the uni).

What's the best way to acknowledge them in my thesis?