The phrase "a letter that explains" is correct and usable in written English.
You can use it when referring to a letter that provides clarification or details about a specific topic or situation.
Example: "I received a letter that explains the changes in the company policy."
Alternatives: "a letter that clarifies" or "a letter that details".
They're handed a letter that explains the consequences of breaking the law and offers social services.
Attach a letter that explains the problem, and provide copies (not originals) of any supporting documentation, like a canceled check illustrating that you made a payment.
If you see charges on your card statement for purchases that you (or any family member who uses that card) did not make, you need to send a letter that explains which charges you did not make.
They must be willing to make a public statement and send a letter that explains their decision to pledge.
If your application is denied, you should receive a letter that explains the Copyright Office's reason for rejecting it.[9].
Write yourself a letter that explains what you intend to do and why.
Virgin responded by running ads with a letter that explained why Virgin's service was better than British Airways'.
The Reformed Church of Highland Park in central New Jersey responded immediately, sending over a letter that explained that the group was going to join the 3,000 volunteers who have so far helped 200 families get back into homes damaged by Hurricane Sandy.
Instead, Horta said she got a letter that explained Prime would need additional documents from her before it approved a refund.
In November, 90 days after that first payment had gone missing, the PHH Mortgage refused the fourth payment, returning the check with a letter that explained the account was in arrears.
Fuller informed her mother about Ossoli and Angelino in August 1849 in a letter that explained that she had kept silent so as not to upset her "but it has become necessary, on account of the child, for us to live publicly and permanently together".
