Complex sentence: After the Third partition of the Polish-Lithuanian Commonwealth in 1795 Volhynia became the Volhynian Governorate of the Russian Empire and covered an area of 71,852.7 square kilometers.
Split into simpler sentences: After the Third partition of the Polish-Lithuanian Commonwealth in 1795, Volhynia was annexed as the Volhynian Governorate of the Russian Empire. It covered an area of 71,852.7 square kilometers.