Complex sentence: Shortly afterwards, on 17 September during Stalin's Great Purge, he was subjected to a second trial, condemned to ten years without the right to correspond with the outside world; however, Kondratiev was executed by firing squad on the same day it was issued.
Split into simpler sentences: Shortly afterwards, on 17 September during Stalin's Great Purge, he was subjected to a second trial, condemned to ten years without the right to correspond with the outside world. However, Kondratiev was executed by firing squad on the same day it was issued.