I created a campaign in Google AdWords and some ads in it and gave them URLs like

mydomain.tld/registration/?utm_campaign=mycampaing&ad=x
mydomain.tld/registration/?utm_campaign=mycampaing&ad=y
mydomain.tld/registration/?utm_campaign=mycampaing&ad=z

All ads lead to the registration page.

A registration is a visit of the page

mydomain.tld/registration-complited/?user={ID}

So I can track the registrations in Google Analytics. I just go to Behavior -> Site Content -> All Pages and filter the pages to registration-complited.

But how can I see, how many and which users have registered, after they came from an ad of a campaign, e.g. utm_campaign? And how can I also track this for a sigle ad of the campaign, e.g. x?