Complex sentence: Later in Rome, the victorious Constantine definitively disbanded the Praetorian Guard and afterwards instituted a new arm of Imperial household guards as their replacements, the Scholae Palatinae, or "Palatine College".
Split into simpler sentences: Later in Rome, the victorious Constantine definitively disbanded the Praetorian Guard for good. Afterwards, he instituted a new arm of Imperial household guards as their replacements, the Scholae Palatinae, or "Palatine College".