Jethro, the priest of Midian, Moses' father-in-law. Rather, "Jethro, priest of Midian, Moses' brother-in-law." See the comment on Exodus 3:1; and note that the Seventy use the ambiguous word γαμβρός, while the Vulgate has cognatus.
And that. Rather "in that." The clause is exegetical of the preceding one.