Complex sentence: At the end of 21st Century, a global war devastates the Earth, the remaining habitable territory is at minimum and is divided into two--the United Federation of Britain (UFB) and the Colony (Australia).
Split into simpler sentences: At the end of 21st Century, a global war devastates the Earth. The remaining habitable territory is at minimum and is divided into two--the United Federation of Britain (UFB) and the Colony (Australia).