Splitting it into two policies may be an option, but not all insurance companies offer this choice. If your insurer doesn’t allow the separation of the policies, there is an alternative option you can consider.
You cancel the joint policy and you both take out single life insurance policies with figures matching your new circumstances and new term lengths. This option may be better than splitting the joint policy into two, as it will be calculated to your new individual needs rather than the old figures being split down the middle.