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Ok, you can make it so your main page shows the news like your first example. To do that goto Admin > Preferences > System > General Settings. From there on the fifth line you'll see
Module for your start page. Change that from None to News and click Ok at the bottom of the page.
You can also keep the main page the way it is and add a News block (Recent news) to the main page like you have in your second example. The reason your news is split is because it looks like you told the block to be center/left and center/right. Change that block to be center/center and it will look like the first example.
Hope this helps
Regards,
JP