Complex sentence: The Soviets flew planes that had Chinese or North Korean markings and were initially forbidden from speaking in Russian over the airwaves, but the ban was soon lifted due to obvious problems of using Korean to communicate in critical battle situations.
Split into simpler sentences: The Soviets flew planes that had Chinese or North Korean markings and were initially forbidden from speaking in Russian over the airwaves. The ban was soon lifted due to obvious problems with using Korean to communicate in critical battle situations.