en_tn_lite_do_not_use/deu/17/15.md

then you say, 'I will set a king over myself, like all the nations that are round about me,' then

This has a quotation within a quotation. A direct quotation can be stated as an indirect quotation. Alternate translation: "then you decide that you want a king just like the peoples of the nations that surround you have kings, then" (See: rc://en/ta/man/translate/figs-quotesinquotes and rc://en/ta/man/translate/figs-quotations)

someone from among your brothers

"one of your fellow Israelites"

a foreigner, who is not your brother, over yourself

Both of these phrases mean the same thing. They both refer to a person who is not an Israelite. Yahweh is emphasizing that the people of Israel should not let a foreigner rule over them. Alternate translation: "a foreigner over yourself" or "a non-Israelite over yourself" (See: rc://en/ta/man/translate/figs-doublet)