Original: The surviving portions of his two major works—the Annals and the Histories—examine the reigns of the Roman Emperors Tiberius, Claudius, Nero and those who reigned in the Year of the Four Emperors.
Simplified: The surviving parts of his two major works—the Annals and the Histories—report about the reigns of the Roman Emperors Tiberius, Claudius, Nero, Galba, Otho, Vitellius, and Vespasian.