Move two independent sites to network

It’s a good idea to search WP DEV before you post a new question: https://wordpress.stackexchange.com/search?q=migrate+multisite

And Google is a good try, too: http://www.google.com/search?&q=move+single+site+to+multisite+wordpress

The WordPress Codex is a good place to start: http://codex.wordpress.org/Migrating_Multiple_Blogs_into_WordPress_3.0_Multisite

Since Version 3.0, WordPress includes new multisite features, meaning
that it can run many blogs, even with their own separate domains, on
one WordPress installation. This tutorial explains how to migrate
multiple WordPress installations into one new WordPress multisite. You
can migrate sites that are using their own domain, as well as sites
using a subdomain on your main domain.

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