Complex sentence: In this operation, 9 civilians allegedly were identified as German auxiliaries (in Soviet language: Nazi collaborators) responsible for the prior incident, and murdered by Kononov's men upon the ad-hoc Military Tribunal verdict.
Split into simpler sentences: In this operation, 9 villagers were accused of being German auxiliaries (in Soviet language: Nazi collaborators) responsible for the prior incident. The 9 villagers were killed by Kononov's men upon an ad-hoc Military Tribunal verdict.