Separating one account for two people

Go you husband iPhone and iPad and then sign out your Apple ID account.

When prompted about the data, just select keep on my iPhone/ipad.

Then if he has another email that is not an apple account yet, you can create a new one: https://support.apple.com/en-ph/HT204034

Also set up Family Sharing to keep access to your apps/purchases. Also see Winston Churchill's response in the below discussion

How to transfer all files from one iCloud account to another

Apple ID email address or password - What to do after you change

Family Sharing

Family Sharing - Use your own Apple ID for Family Sharing

Family Sharing -What types of content can I share?

Family Sharing - If you don‘t see your family‘s shared content

Family Sharing - purchases and payments

Family Sharing - Hide and unhide music, movies, TV shows, audiobooks, and books

Family Sharing – share iCloud Storage

Family Sharing - Share an iCloud storage plan with your family

Family Sharing and location