Blog problems

Rats. I'm using a PHP include string to pull in 2 different blogs to this page. Unfortunately the second blogs template is overriding the first, thus both appear in the same format. Any advice? I would strip all code out of the template and only use an external css file to apply the styles, but I can't seem to separate the blog's different parts in that manner, and can only apply backround colours and borders to the entire blog, as opposed to individual posts.