Complex sentence: In January 1919 the leader of imyaslavtsy Anthony Bulatovich stopped any relations with the Holy Synode and Tikhon and returned to his family estate in Lebedinka, there he was killed by some robbers in December.
Split into simpler sentences: In January 1919 the leader of the imyaslavtsy, Anthony Bulatovich, broke relations with the Holy Synod and Tikhon and returned to his family estate in Lebedinka. There, he was killed by some robbers in December.