Complex sentence: The campaign then steps up towards the Soviet attack on Seattle and its surrounding countryside, the next few missions take place in the US countryside where guerrilla resistance members have made successful attacks on Soviet units which has fueled Malashenko's hatred and planned vengeance against the Americans.
Split into simpler sentences: The campaign then steps up toward the Soviet attack on Seattle and its surrounding countryside. The next few missions take place in the US countryside, where guerrilla resistance members have made successful attacks on Soviet units, fueling Malashenko's hatred and planned vengeance against the Americans.