Complex sentence: While being transported, according to Dio, "like the commonest criminal" back to Antioch, shortly after injuring himself in an escape attempt, he was beheaded in Cappadocia by the centurion Marcianus Taurus.
Split into simpler sentences: While being transported back to Antioch, "like the commonest criminal" according to Dio, he injured himself in an escape attempt. He was beheaded in Cappadocia by the centurion Marcianus Taurus.