Complex sentence: Meanwhile, back in Bunzlau, renamed Bolesławiec, a new and Polish chapter in the pottery's history was opening, after the city had been severely damaged in the war and its Germanic population expelled.
Split into simpler sentences: Meanwhile, back in Bunzlau, renamed Boleslawiec, a new and Polish chapter in the pottery's history was opening. The city had been severely damaged in the war and its Germanic population expelled.