Complex sentence: Rogers is now a gang leader and his forces as well as the other American gangs have surrounded the great cities and are attacking constantly but the airlords are determined to use their fleet of airships to break the siege.
Split into simpler sentences: Rogers is now a gang leader and his forces, as well as the other American gangs, have surrounded the cities and are attacking constantly. The airlords are determined to use their fleet of airships to break the siege.