Complex sentence: The Romans had conquered most of the eastern world by 64 CE. Ancient Rome lasted from 753 BCE to 476 CE. Lasting roughly 1229 years and one of the key reasons for Rome to success was their military.
Split into simpler sentences: The Romans had conquered most of the eastern world by 64 CE. Ancient Rome lasted from 753 BCE to 476 CE. The Roman Empire lasted roughly 1229 years. One of the key reasons for Rome to success was their military.