Two blogs one page

There are a variety of ways to create a two-column design in WordPress, where most typically you would use a theme that already has support for doing so.

This page has a pretty nice listing of the different ways that you can create a two-column layout on your site: http://vip.wordpress.com/documentation/how-to-create-columns-in-posts/

You can also go to the wordpress.org Themes Directory and search using their Tags system to narrow down themes that will help you do what you are trying to accomplish. For example:

Choosing a Two-Column Theme