By default, you can set some of these properties in the Settings > URLs and SEO > URL Format. In here you can see there is a forbidden URL character setup. By default "&" is included. It will automatically replace it with a "-" (dash). Since this is NOT what you want, you have a few options (listed simplest to hardest):
- Educate your content entry people to enter "and" vs. "&" when adding content to the field which generates the URL.
- Create a global event handler on insert and update of pages to do a
string.Replace() of the path.
- Use a URL Rewrite rule to change "&" to "and". Problem with this is it may mess up anything you might have querysting parameters for.
There are probably other ways, but those are the ones I've initially thought of.