Original sentence: Cossacks were made up mostly of escaped serfs who preferred the dangerous freedom of the wild steppes, rather than life under the rule of Polish aristocrats.In the 1500s a great organizer, Dmytro "Bayda" Vushneveckiy, a noble, united these different groups into a strong military organization
Edited sentence: Cossacks were made up mostly of escaped Ukrainian serfs who preferred the dangerous freedom of the wild steppes, rather than life under the rule of Polish aristocrats.In the 1500s a great organizer, Dmytro "Bayda" Vushneveckiy, a Ukrainian noble, united these different groups into a strong military organization