Abram leaves Egypt a wealthy man, and takes with him his wife and his brother Lot and his family. They go back to Bethel the problem is that the land won’t support them all. So Abram and his brother agree to part ways – Lot goes towards Sodom and Abram goes to the plain of Mamre (modern Hebron). There he builds an altar.
In other words:Abram and his brother Lot leave Egypt, and go their separate ways.
Sodom and Gomorrah were apparently quite nice before God destroyed them (Genesis 13:10)
Don’t fight over land and resources (Genesis 13:8,9)