Recommended plugin is Genesis Widget Areas Generator.
Step 1: Creating split sidebars. Navigate to Widget Generator > Add New and creating two sidebars ( left and right )
Step 2: Now go to Appearance -> Widgets and add widget(s) in left and right widget areas.
Now refresh your home or inner page and you will get the split sidebars at below of your primary sidebar. Selecting the “genesis_before_sidebar_widget_area” action you can show it at top of your primary sidebar also.