I don't know how your data is related so not sure how HIM and SIS could be displayed on one form. It is possible they could be joined in a query and that query be the RecordSource for a form or subform. Or maybe would have to be several subforms on a main form. The subforms could sit side-by-side or be organized on pages of a tab control. A consideration is whether forms need to allow data entry or just for display and review of data.
Two tables with similar names makes me think should be one table. Are the fields the same in both?