# People from the Negev will possess the mountain of Esau

"The Israelites in the Negev will take the land of the Edomites"

# the people of the lowlands

This refers to Israelites in the western foothills of Israel who will capture the land of the Philistines in battle.

# They will possess

Here "They" appears to refer to the people of Israel in general.

# Benjamin will possess

"the tribe of Benjamin will possess" or "the descendants of Benjamin will possess"