en_tn_lite_do_not_use/ezk/30/08.md

General Information:

These are Yahweh's words about Egypt.

Then they

Possible meanings are 1) "Then people" or 2) "Then the Egyptians."

they will know that I am Yahweh

Yahweh is implying that they will know that he is the one true God who has supreme authority and power. See how you translated as similar phrase in Ezekiel 6:7. Alternate translation: "they will understand that I am Yahweh, the one true God" or "they will realize that I, Yahweh, have supreme power and authority" (See: rc://en/ta/man/jit/figs-explicit)

when I set fire in Egypt

Here "set fire in Egypt" represents sending an army to attack Egypt and set fires. Alternate translation: "when I send an army to burn Egypt with fire" (See: rc://en/ta/man/jit/figs-metonymy)

all of her helpers are destroyed

This can be stated in active form. Alternate translation: "I destroy all of the allies of Egypt" or "when armies destroy all of those who help Egypt" (See: rc://en/ta/man/jit/figs-activepassive)