Display multiple group names or groups below each other

I want to show 2 groups below each other. Since I have not yet found a way to do this, I would also like to have a fixed text ad. As 2nd heading in a group.

That is what is look at the moment

That is what i want to have. It doesn't matter if there are 2 groups or one group, with the same style for the 2nd headline "Nachrichten".