Complex sentence: In 1742, most of Silesia was seized by King Frederick the Great of Prussia in the War of the Austrian Succession, becoming the Prussian Province of Silesia; consequently, Silesia became part of the German Empire when it was proclaimed in 1871.
Split into simpler sentences: In 1742, most of Silesia was seized by King Frederick the Great of Prussia in the War of the Austrian Succession, and became the Prussian Province of Silesia. Consequently, Silesia became part of the German Empire when it was proclaimed in 1871.