Can some help me revise this sentence to eliminate jargon and use short familiar words? I just need to see how one is done so I can complete the rest of the questions myself.

With regard to the aforementioned letter of July the 15th we expect to expedite your order to ship no later than July 21. Your affirmation via signature will conclude all manner of business regarding this transactions.

3 answers

We'll send your order no later than July 21. Your signature that you've received it, will complete this transaction.
So I don't have to mention the letter at all?
I don't think it's necessary.