There are a few ways

1. Use simple url setting on page. This let's you create one short url like /campaign or similar for your page that has a long url.

2. Create a second page and use the Episerver shortcut functionality in edit mode to redirect to the first page. This will make any number of urls redirect to the first if you are willing to create multiple pages.

3. Same as two but use fetch data from functionality instead. This will basically create a clone of the first page that will be automatically updated if you update the first. You will have multiple urls pointing to the same content.

4. Use SEO manager addon. You can setup any number of redirects, either exact match or by regex, or simple urls without creating additional pages in edit mode.

Beware of SEO penalty of duplicate content if you don't add canonical links...Applies to fetch data and simple url solution above...