Complex sentence: Avtorkhanov was invited to that session as a member of the Chechen-Ingush establishment; he was arrested and groundlessly accused of preparing an armed uprising, espionage, counterrevolutionary propaganda, etc. Some of those accusations carried the death penalty.
Split into simpler sentences: Avtorkhanov was invited to that session, as a member of Chechen-Ingush establishment, and he was arrested too. He was groundlessly accused of preparing armed upraise, espionage, counter-revolution propaganda, etc. Some of those accusations lead to the death penalty.