Complex sentence: Some Russian councilors of Menelik II and a team of fifty Russian volunteers participated in the battle, among them Nikolay Leontiev, an officer of the Kuban Cossack army.
Split into simpler sentences: Some Russian councilors of Menelik II and a team of fifty Russian volunteers participated in the battle. Among them were N. Leontjev, an officer of the Kuban Cossack army.