Here "falls into" is an idiom that means to become something worse. AT: "the land becomes a desolate waste" (See: [[rc://en/ta/man/translate/figs-idiom]])
Here Yahweh speaks about himself in the third person. AT: "until I, Yahweh, have sent all the people far away from their land, so that no one is left" (See: [[rc://en/ta/man/translate/figs-123person]])