Complex sentence: The Russian authorities however could not prove Stetsenko's complicity, and he was exiled from Kyiv but he managed to return to the city only to leave one year later due to political and economic pressures.
Split into simpler sentences: The Russian authorities could not prove Stetsenko's complicity, and he was exiled from Kyiv. He managed to return to the city only to leave one year later due to political and economic pressures.