5:9a They also settled in the east as far as the edge of the desert

To the east, they settled as far as the ⌊entrance⌋ of the desert.
-or-
Their east border was the desert. (Easy English Bible)

5:9b that extends to the Euphrates River,

The desert stretches out ⌊from there⌋ to the Euphrates River.
-or-

⌊The desert⌋ extends ⌊from there⌋ to the river Euphrates.

5:9c because their livestock had increased in the land of Gilead.

⌊They lived there⌋ because while they were in Gilead, their flocks of animals had become large.
-or-

⌊Their land extended that far⌋ because while they were in Gilead ⌊region⌋ , their flocks of animals had become bigger and bigger.

5:9a-c (reordered)

While the Reubenites were in Gilead their herds had gotten bigger and bigger. For this reason, they settled to the east as far as the edge of the desert. That desert stretches ⌊from there⌋ to the Euphrates River.
-or-
The Reubenites had large herds in ⌊the region of⌋ Gilead. So they went and occupied the land as far east as the desert that stretches all the way to the Euphrates River.

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