Nesting only text from WP in main webpage

Hi!
I’m running a webpage for my theater group, and I added WP so that everyone in the group could easily update without having to go the long way (altering the html-file and uploading it to the server). Problem is, I would like a certain category to be nested (I think nested is the proper term) inside the main webpage. I have managed all this with an iframe, but it doesn’t look very pretty when the text area itself is so small in the WP page.

So here’s my real question: is there a way to get just the posts from WP to be nested in the webpage, without the header (since it says the same thing on top of the webpage), and preferably also without the sidebar?

I will be very grateful for any tip on how this can be achieved. I tried altering the css of the WP, but then the blog looked kinda stupid. Should I use some sort of rss maybe?