Goat Notes

There is always story that happened before, and story that happens at the same time, to people not-protagonists, and story happening on a larger scale or far away that may or may not impact the events which you relate - so while I appreciate that your challenge looks like a monumental challenge, this sounds merely like intense backstory - much more important to you, who knows the protagonist, than to your readers, maybe. If I were tackling this.. I don't know. It seems to me as if some of it probably needs to be foreshadowed in the first part; that there might be room for a prologue in the second, and little vignettes scattered throughout. And to a degree you probably need to write a lot of it to know what happened and how it played out, just so you can daub it on lightly.