The downstream people settled in the area where the Arkansas River met the Mississippi, where the meandering of the two massive rivers had deposited nutrient-rich soil conducive to farming.
(The downstream people; settled; in the area) (the Arkansas River; met; the Mississippi; L:the area) (the meandering of the two massive rivers; had deposited; nutrient-rich soil conducive to farming)
The downstream people the Arkansas River the meandering of the two massive rivers
settled met had deposited
in the area
the Mississippi L:the area
nutrient-rich soil conducive to farming