Complex sentence: After the Great Northern War (1700--1721) Ukraine was divided between a number of regional powers and, by the 19th century, the largest part of Ukraine was integrated into the Russian Empire with the rest under Austro-Hungarian control.
Split into simpler sentences: After the Great Northern War (1700--1721), Ukraine was divided among a number of regional powers. By the 19th century, the largest part of Ukraine was integrated into the Russian Empire, with the rest under Austro-Hungarian control.