To split these prefs panels, open the Finder and navigate to /System -> Library -> PreferencePanes. Control-click on the Localization panel and select Show Package Contents, and then navigate to Contents -> Resources. You'll see three panes in that folder:
- IntlFormats.prefPane
- IntlKeyboard.prefPane
- IntlLanguages.prefPane
You can do this same magic on the DateAndTime and DesktopScreenEffects prefPanes as well.
[robg adds: Due to the permissions on the source folder, you'll be copying these sub-panes, not moving them, so the originals are untouched -- a good thing, as you can't damage them with this little trick. As seen in the screenshot, they show up in the Other category. I'm not sure if there's a way to re-categorize them or not; there's nothing obvious in the Info.plist or InfoPlist.strings files...]

