Going through a divorce—how do I help my kids?

My children (8 and 11) are really struggling with our recent divorce, and I don’t know how to make this transition easier for them. I reassure them that both parents love them, but they’re acting out and seem really sad. I don’t know if I should put them in therapy, give them time, or do something else entirely. What helped your kids cope with a major family change like this?