Complex sentence: Arrested and interrogated six months by the Soviet NKVD, he was sentenced to eight years in Soviet forced labor camps and barely survived two years before being "amnestied" with other Poles by the Soviets after Hitler's invasion of the Soviet Union (June 1941).
Split into simpler sentences: Arrested and interrogated six months by the Soviet NKVD, he was sentenced to eight years in Soviet forced labor camps. He barely survived two years before being "amnestied" with other Poles by the Soviets after Hitler's invasion of the Soviet Union (June 1941).