Complex sentence: While the Hunger Plan was first designed for the Soviet Union, it was soon expanded to include occupied Poland (General Government); similarly to the Soviet Union, the Jewish population in ghettos suffered most heavily, although Poles faced increasing starvation as well.
Split into simpler sentences: While the Hunger Plan was first designed for the Soviet Union, it was soon expanded to include occupied Poland (General Government). Similar to the Soviet Union, the Jewish population in ghettos suffered most heavily, although Poles faced increasing starvation as well.