How do I split artist / title ?

My tags in the title field are listed as artist / title.
How can I correct this so that artist and title are in the correct fields?

Thanks

Create an action of the type "Import tag field (Guess value)" for %title%
Enter as guessing pattern: %artist% / %title%

Thank You

I've been trying to figure this out for a long time. Thanks!! This will save hours of work.