Groovy - Filtering list by employer, role, project document ID, certification

I am trying to figure out how to filter a list of users that will be going to a drop down menu by employer, role, project document ID, and if certified. I only users that meet all the requirements to be displayed on the list. I can not get the code to compile correctly. I am using too many ifs? Is there a better way to write it? Thank you for any help in advance.

I am attempting to filter the listed users by employer, role, and
if they have an active certification.

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