Complex sentence: Unlike other 4X games however, in "Endless Legend" the world map is also formed of separate regions that once a city has been established within its borders for the first time, the entire region become part of a faction's territory and control.
Split into simpler sentences: Unlike other 4X games, however, in "Endless Legend" the world map is also formed of separate regions. Once a city has been established within the borders of a region for the first time, the entire region become part of a faction's territory and control.