Complex sentence: Throughout the 1st century, Roman policy largely dictated that threats from neighbouring nations and provinces were to be contained promptly, following a heavy defeat at the hands of the Dacian King Decebalus's skirmishing forces.
Split into simpler sentences: Throughout the 1st century A.D., Roman policy largely dictated that threats from neighbouring nations and provinces were to be contained promptly. Following a heavy defeat at the hands of the Dacian king Decebalus's skirmishing forces.