When I add multiple groups of campaigns to my Advanced Segmentation query like this:
(tracking_sent not exists)
I receive an error similar to the following:
Encountered "campaigns" at line 7, column 1. Was expecting one of: "(" ... ... ... ... ... ... "not" ... "!" ... "ExistsList" ...
The 'campaigns' argument in the Advanced Segmentation Rules can only appear in a query once. While you can query for events in multiple campaigns by grouping them together, there is no option to add multiple groups of campaigns. This is why you cannot make different groupings from the Event Based Segmentation wizard.
Instead, you must use the Standard Segmentation to create a Rule of this type.