Original: Also, in Britain in 184, the governor Ulpius Marcellus re-advanced the Roman frontier northward to the Antonine Wall, but the legionaries revolted against his harsh discipline and acclaimed another legate, Priscus, as emperor.
Simplified: In Britain in 184, the governor Ulpius Marcellus pushed the Roman frontier north to the Antonine Wall, but the soldiers revolted against his harsh discipline.