I don;t have an easy answer. My therapist gave me a book to read that's by a therapist, written for people with d id and it's geared toward the younger ones, so it's very simply put, but not something I would suggest for your husband. Just wanted to say that I'm glad your h is trying to understand. I would not get into diagnostic or clinical descriptions with him, since it's really not going to help a layperson understand and is more for a clinician to use in diagnosis.