I don't know why you'd want to do that, since properly working content depends on the directory structure contained within the Content folder within the archive.
IIRC (on mobile right now, sorry) WinRAR has a selection to Ignore Folder Structure, or something to that effect. You may have to noodle around in the options to show hidden menu items to find it.
Or, just go folder by folder and drag the files out of the RAR window to your chosen location.