Complex sentence: Although heavily criticised by many, has given them a strong hold on their resident population who find the Federation's way, although imperfect, to be a realistic and acceptable alternative to the poverty, crime and squalor that is prevalent in much of the world.
Split into simpler sentences: Although heavily criticised by many, it has given them a strong hold on their resident population. They find the Federation's way, although imperfect, to be a realistic and acceptable alternative to the poverty, crime and squalor that is prevalent in much of the world.