Complex sentence: Bordered on two sides by rivers and on the third by an electric fence, the city has become a sanctuary, with the rich and powerful living in a luxury high-rise called "Fiddler's Green" while the rest of the population subsists in squalor.
Split into simpler sentences: Bordered on two sides by rivers and on the third by an electric fence, the city has become a sanctuary. The rich and powerful live in a luxury high-rise called "Fiddler's Green", while the rest of the population subsists in squalor.