Complex sentence: In Soviet times, Hayrikian was placed several times in penal labor camps for his political activiies and eventually stripped of Soviet citizenship and exiled to Ethiopia after his accusations of Soviet leadership in the instigation of Sumgait pogroms of Armenian population in Azerbaijan.
Split into simpler sentences: In Soviet times, Hayrikyan was placed several times in penal labor camps for his political views and activities. He was eventually stripped of Soviet citizenship and exiled to Ethiopia after his accusations that the Soviet leadership instigated the Sumgait pogroms of Armenian population in Azerbaijan.