Complex sentence: Klaus Mietusch was born on 5 August 1918 in Posen in the Province of Posen, a Prussian province in the German Empire, today it is Poznań in the west-central region of Poland.
Split into simpler sentences: Klaus Mietusch was born on 5 August 1918 in Posen in the Province of Posen, a Prussian province in the German Empire. Today it is Poznań in the west-central region of Poland.