The "Bottom Line" version:
This is a SPAM free zone. If you give me your email for the newsletter or a discount, the only thing that I use it for is the newsletter and marketing. It allows me to share a special price or discount I think you might like. You can opt out at any time via the unsubscribe button on the newsletter or emailing me at firstname.lastname@example.org.
I don’t collect or use any personal data other than what would be relevant to the newsletter, and marketing prints to you personally (as in sending you an email). I don't sell your data.
I am sure I could fill several pages with technical jargon to make lawyers happy but this is it in a nutshell.