Portals do not support dynamic sorting. There's a complex work around based on calculation fields and scripting that appear to dynamically sort the portal by changing a value in a global field or variable, but you asked for simple.
The simplest method is to add a tab control to your layout and put two copies of the same portal into the control, but with different sort orders specified in Portal Setup. Then you can click the tabs to see the same portal but with records sorted in different orders.
Thanks Phil. I think I will just use the table view and create a button to take me to that layout. I appreciate all the help you provide, you are a godsend!