Simeon is left in prison in Egypt and the brothers must return with Benjamin to get more provisions. Jacob is hesitant, but Reuben promised that Benjamin would be safe. Jacob sent double payment (Joseph had put their money back in their bags when they left) and sent them on their way, reluctantly. Simeon has been in prison in Egypt this whole time. (I wonder if he thought they weren't coming back for him?)
"Joseph's brothers returned to Egypt, and the plot deepens as Joseph (after several "tests" of his brothers**) reveals his identity to his unsuspecting brothers. Joseph wept as he told his brothers who he was. Yet right in the midst of confessing his identity, he declares that through his brothers sold him into slavery, God had a plan all along."
The brothers leave with lots of supplies, return home, get Jacob, and the entire family (70 people) relocates to Egypt (Goshen). One thing to remember, God doesn't concoct a plan when things go wrong. He is not reactive. His plans and purposes will be accomplished.
**my addition to the quote
The Story of Redemption, Volume 1 | Genesis - 2 Samuel by The Daily Grace Co.