How do you want the data combined?
Here’s an example formula, but you may want to adjust it to get the display you want:
IF(AND({Contract Ended?}= "No",({Exclusive?}="Exclusive")), Rights & '\n' & {Holdback Rights}, BLANK())
It will have the content from the {Rights}
field, and then a line break, then the content from the {Holdback Rights}
field.