Complex sentence: As the field was cleared, silence descended on the arena as the King had instructed that anybody who interfered in the duel would be executed and that anyone who shouted or verbally interrupted the combat would lose a hand.
Split into simpler sentences: As the field was cleared, silence descended on the arena. The King had instructed that anybody who interfered in the duel would be executed and that anyone who shouted or verbally interrupted the combat would lose a hand.