The part with the chunk out of it is the drum for the drum/shoe park brake assembly. The pieces in the bottom are a part of the slack adjuster and other shrapnel. They may not have properly attached the pin/shoe hold down springs with the hold down spring cups and the shoe assembly could have came away from the backing plate. By the looks of the scoring, pieces had been tumbling inside and the shoes rubbing on the inside of the hub. Or something else came loose and was caught rubbing between the shoes and the hub.
I'm not a mechanic either but have replaced quite a few different brake assemblies on a variety of vehicles. Somebody else with more experience like Randy Bo Bandy will likely have a better idea.
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