Complex sentence: After that Vasiliy was taken by Tokhtamysh to the Blue Horde as a hostage, where he was kept until he tried to escape in 1386, whereupon he was caught and brought back to be punished by the Khan.
Split into simpler sentences: After that Vasiliy was taken by Tokhtamysh to the Blue Horde and kept as a hostage. In 1386,Vasiliy attempted an escape however he was caught and brought back to be punished by the Khan.