Complex sentence: They can't figure it out on their own, and never learn--a few hours later, Pipo is found vivisected in the grass; his corpse does not even have the benefit of a tree (The symbol of honor placed among all dead piggies).
Split into simpler sentences: They can't figure it out on their own, and never learn. A few hours later, Pipo is found vivisected in the grass; his corpse does not even have the benefit of a tree (The symbol of honor placed among all dead piggies).