This can be reworded with only one of the negatives. Alternate translation: "He devoured everything, and there is nothing left" or "There is nothing left because he devoured everything" (See: [[rc://en/ta/man/jit/figs-doublenegatives]])
Here "devour" represents taking things for himself. Alternate translation: "There is nothing left that he did not take for himself" or "He took everything for himself, and there is nothing left" (See: [[rc://en/ta/man/jit/figs-metaphor]])