I did this for a while on my own Multisite network. Essentially, I had one site that was a central “hub” for all the others and pulled in content from the entire network.
It’s not easy, but it can be done. One approach (the approach I used at the time) used a plugin to automatically re-post content from each site on the central “hub” site. The plugin is called Sitewide Tags and was originally intended to enable network-wide content searching.
A couple of talented WordPress users put together an ebook that details how to use the plugin, how to configure your network, and how to create “Network Homepages” similar to what you’re asking for.
You can buy the ebook here.
Note: This is not my ebook and not an affiliate link. I used this ebook while setting up my own network “hub” site, which is why I’m comfortable recommending it.
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