took Zipporah, Moses' wife ... and her two sons

Possible meanings are 1) Jethro took Zipporah and her two sons to Moses, or 2) Jethro had earlier welcomed back Zipporah and her two sons.

Gershom

This is a son of Moses and Zipporah, whose name means "foreigner." (See: rc://en/ta/man/translate/translate-names)