What does Joshua 19:9 mean?

Simeon’s land was taken from Judah’s larger territory, because Judah had more land than they needed. That’s why Simeon’s share was inside Judah’s borders. Joshua 19:9 - Modern Text Bible

(This explains why Simeon’s territory was carved out of Judah’s land: Judah’s portion was too big, so some of it was given to Simeon.)