Complex sentence: The inhabitants of three Latin towns (Caenina, Antemnae and Crustumerium) take up arms one after the other but are soundly defeated by Romulus, who kills Acron, the king of Caenina, with his own hand and celebrates the first Roman triumph shortly after.
Split into simpler sentences: The inhabitants of three Latin towns (Caenina, Antemnae and Crustumerium) take up arms one after the other and are soundly defeated by Romulus. Romulus kills Acron, the king of Caenina, with his own hand and celebrates the first Roman triumph shortly after.