Complex sentence: There is a post office at the nearby community of Bridal Veil that handles a lot of mail, most of it wedding invitations shipped there in order to have the town's postmark applied to them.
Split into simpler sentences: There is a post office in the nearby community of Bridal Veil that handles a lot of mail. Many couples have their wedding invitations shipped there in order to have the town's postmark applied to them.