en_tn/act/17/26.md

General Information:

Here the word "he" refer to God, the creator, and both instances of "their" refer to every nation of people living on the surface of the earth.

one man

This means Adam, the first person God created. This can be stated to include Eve. It was through Adam and Eve that God made all other people. Alternate translation: "one couple"

having determined their appointed seasons and the boundaries of their living areas

This can be stated as a new sentence. Alternate translation: "and he determined when and where they would live"