If it fits in 6 minutes it's not so convoluted, there's a guy who made a (10 hour?) video trying to explain all the lore and story of Destiny 1 and Destiny 2 (and all their various DLC/paid seasons). And the guy who made this apparently lost interest towards the end of Destiny 2 as a live service game so there's easily another 2-3 hours of content covering the final beats of the story.

https://www.youtube.com/watch?v=zzBmOeYmN_M

But I agree the overall story/timeline of all MGS games taken as a whole is really wild. It's definitely quite something.