Complex sentence: Immanuel Kant was born in 1724 in Königsberg, Prussia (since 1946 the city of Kaliningrad, Russia), as the fourth of nine children (four of them reached adulthood).
Split into simpler sentences: Immanuel Kant was born in 1724 in Königsberg, Prussia, today the city of Kaliningrad, Russia. He was the fourth of nine children (four of them reached adulthood).