Complex sentence: In 1920 the requisitions were increased from 18 million to 27 million poods in the region, whereas peasants reduced the grain production knowing that anything they did not consume themselves would be immediately confiscated.
Split into simpler sentences: In 1920 the requisitions were increased from 18 million to 27 million poods in the region. This caused the peasants to reduce their grain production knowing that anything they did not consume themselves would be immediately confiscated.