In essence: FO late on the round out, a 2.0G hard landing startles the skipper who - sitting in a descending cockpit - made a large FWD control input, but the main-gear had already bounced and the aircraft was climbing aft of CoG. Spoilers up at 30deg following wheel spin-up. Second flat bounce at 3.0G, main- and nose-gears, spoilers deploy to 60deg due gear compression. Both pilots pull back and after reaching a ridiculous AoA the last 4.0G impact results in structural failure aft of the wings. Skids off, crew evacuates - FO with back injuries.
Uncharactaristic for an MD-11, in such a situation, not to have a main-gear plow through a wing with catastrophic spar failure as a result. They're lucky to have walked away.
Report suggest, among other things of course, Boeing rewrite the manual on recovery from bounced landing.