Complex sentence: 'Roman fever' refers to a particularly deadly strain of malaria that affected the Roman Empire throughout various epochs in history; an epidemic of Roman fever during the fifth century AD may have contributed to the fall of the Roman empire.
Split into simpler sentences: 'Roman fever' refers to a particularly deadly strain of malaria that affected the Roman Empire throughout various epochs in history. An epidemic of Roman fever during the fifth century AD may have contributed to the fall of the Roman empire.