Multi-site data migration/sharing and mail merge

We are in the middle of a major renovation of our WordPress site from a single overburdened site to a network of 5 sites all on the same domain. We’re having some issues getting the data from the original single site to migrate over and feed the 5 new sites.

Also, I would like to find a way to export the SQL data from the site into my computer, allowing us to mail merge data into Word documents and email them.

Big dreams can bring big rewards. Anyone have ideas?