Complex sentence: After World War II, Germany suffered heavy losses both in lives and industrial power: the country's cities were severely damaged from the heavy bombings in the closing chapters of World War II, agricultural production was only 35% of what it was before the war.
Split into simpler sentences: After World War II, Germany had suffered heavy losses, both in lives and industrial power. The country's cities were severely damaged from heavy bombing in the closing chapters of the War and agricultural production was only 35 per cent of what it was before the war.