When running a Query, a user might receive Error: Query Too Complex, depending on the fields they are using on the Criteria tab. A Query will process faster if it contains positive operators. For example, we recommend using 'one of' rather than 'not one of', etc..
Try the following in order:
1. Replace any negative operators 2. Remove any duplicate fields from the Output tab 3. Remove unneeded filters on the Criteria tab 4. Remove unneeded/duplicate sort fields. 5. Run the Query