What would be a better way to write the following sentence?

Question

Is there a better way to write the following sentence?

He privately tutored Social Studies outside of school for about three years, which included US government and politics.

Answer 1

He provided private tutoring in social studies for about three years.

Answer 2

For approximately three years, he provided private tutoring in Social Studies, specifically focusing on US government and politics.

Answer 3

”Outside of school” is an unnecessary detail, but if you still need to use it within a broader context, use the phrase as an introductory element or include it within parentheses instead.

He privately tutored Social Studies, including US government and politics, for about three years.

OR

Outside of school, he privately tutored Social Studies, including US government and politics, for about three years outside of school.

OR

He privately tutored Social Studies (outside of school), including US government and politics, for about three years outside of school.

Answer 4

He privately tutored Social Studies, including US government and politics, for about three years outside of school.