How to insert google ads between posts in sidebar

Greetings,
I'm using the "Recent post's extended" plugin to display latest post's in my sidebars at http://fullnews.gr/category/fullnews/
I want to display 50 latest post's from specific categories and i need to display ads (google ads & custom banners) between every 10 post's.
I cant program the widget to display 10 latest post's from a category, add another "text/shortcode" widget bellow for my ad, and then add again the "recent posts extended" widget to display the next 10 recent posts, it displays again the same 10 posts like the previous widget.
How can i inject my adds inside that "recent post's extended" generated sidebar?
thank you