Layout difficulties

[stormriderstudios]

I'm wanting to create a specific layout for a navbar and I can't seem to track how all the elements come together so I could adjust things. The layout I want is to have the brand box on the far left, horizontal menu in the middle and search bar on the right - which is all easy to do so far. The tricky part comes where I want to add another line of content (a tagline of sorts) under the menu and search bar, while the brand box spans the 2 rows.

Can this be achieved with some CSS trickery of flex or do I need to be looking at rebuilding the navbar using a rows and columns layout?