Complex sentence: Eustachy Daszkiewicz or Ostap Daszko (,; born ca.1495 Ovruch--died after 1535) is considered to be the first recorded leader of a Cossack defense force which debatable due to the fact that there were many others among which is Bohdan Glinski from Severia.
Split into simpler sentences: Eustachy Daszkiewicz or Ostap Daszko (,; born ca.1495 Ovruch--died after 1535) is considered to be the first recorded leader of a Cossack defense force. However that is debatable due to the fact that there were many others among which is Bohdan Glinski from Severia.