New Site URL for Multisite

One of these, or a combination of, may be what you’re looking for:

https://premium.wpmudev.org/project/site-categories/ (watch its video) has the functionality to put each site on a multisite within categories.

However, your “network of networks” might best be served by http://wpebooks.com/networks/
Plus, it may be able to do the URL scheme you’re wanting without needing the Site Categories plugin, above.

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