There’s an O’Reilly book, “Mastering the Lightning Network”
https://github.com/lnbook/lnbook
What type of explanation are you seeking? I can try to provide some useful links
That article strikes me as hermetic, not really trying to speak to people who aren't already deeply involved.
If you want to understand the tech, Mastering the Lightning Network is an excellent resource, although it's obviously a heavy read.
For something between the book and a wikipedia article, try Jameson Lopp's site, starting with the Getting Started section:
https://www.lopp.net/lightning-information.html