The "Choice - Multiple" form control in NWC stores its selections data in a collection. If you just need to get the first/only value from the field, you can use the "Get item from collection" workflow action to extract just the value (without the brackets and quotations) and store that in a text workflow variable. If you need multiple values, then you would need to loop through the collection to pull out each value and add/append it to a text workflow variable.

Hi @jenniferl 

As @bamaeric explained, the values are stored as a collection type.

Here is a simple solution If you just want to remove the square brackets and quotation marks from a multiple choice list, refer to this article https://community.nintex.com/t5/Nintex-Workflow-Cloud-Forum/Way-to-remove-the-square-brackets-and-quotation-marks-from-a/m-p/94884 (using Regex)

If you want the Regex to add a space after the comma, refer to this recent article https://community.nintex.com/t5/Nintex-Workflow-Cloud-Forum/RegEx-to-add-a-space-after-a-comma/td-p/221711 

Credit to @burked for providing the solution to both.

Cheers