This is Dr David
it sounds like she is having some increased anxiety from the recent separation and new sleeping arrangements.
it can be difficult for children to sleep in two separate places during the week
she could also be having separation anxiety from you when sleeping with her father.
it sounds like she is regressing a bit given this stress.
most likely with more time, it will get better.
this is the 2 year old who is getting more clingy, correct.
many kids at 2 years old can act out to get more attention. many people call this "terrible twos"
it doesn't sound like getting back together with your husband and all sleeping under one roof is an option at this point.
it has only been a month.
with more time, most likely your kids will get less anxiety and get more use to the sleeping arrangements with time
you should ask him how sleep time with dad is