Complex sentence: At great personal risk, Samanov finally convinces the Soviet leadership to accept a compromise plan preventing the detonation of nuclear weapons that the United States will be divided into "client states" such as Heartland.
Split into simpler sentences: At great personal risk, Samanov finally convinces the Soviet leadership to accept a compromise plan preventing the detonation of nuclear weapons. Under the plan, the United States will be divided into "client states", such as Heartland.