Here "I" refers to Yahweh. This represents Yahweh sending the Babylonian army to light a fire. Alternate translation: "Then I will cause the Babylonian army to light a fire" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here Nebuchadnezzar represents his army. Alternate translation: "Nebuchadnezzar's army will ... They will" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Taking or destroying everything in Egypt is compared to how a shepherd carefully cleans off his clothes. Alternate translation: "He will take or destroy everything valuable in Egypt just as a shepherd is careful to get every insect off of his clothes" (See: [[rc://en/ta/man/translate/figs-simile]])