Complex sentence: Biron thereupon forced Anne to order an inquiry into Volynsky's past career, with the result that he was tried before a tribunal of Biron's men and condemned to be broken on the wheel and then beheaded.
Split into simpler sentences: Biron thereupon forced Anne to order an inquiry into Volynsky's past career, with the result that he was tried before a tribunal of Biron's men. He was thus condemned to be broken on the wheel and then beheaded.