Reposted blog posts show code when pulling in a script from the source.

Example right here: http://harrydent.com/beta/?p=302

I am forced to use this a s a feed url http://feeds.feedburner.com/Survive-Prosper since the regular yourwebsite/?feed=rss does not work for some reason. The original site has an ad inserted in the middle of the text but when the rss is pulled it just show the code. What can I do to remove this so it just pulls in the text? Thanks!