When diocletian split the roman empire into two parts:
maximian took the western half
it had a long run of powerful leaders that maintained control
the weak emperor constantine died
the western empire would overcome the eastern empire

When Diocletian split the Roman Empire in two parts, Maximian took the Western half.

Explanation:

Maximian was the Western Roman emperor from 286 to 305, chosen by the Emperor Diocletian, who initially gave him control over Western Rome. Later, Diocletian elevated Maximian to August and named Constantius his Caesar. Diocletianus resigned in 305 and also forced the reluctant Maximianus to resign. At the same time, Constantius was renamed Western August. However, Maximianus tried to return to power in 306 after Constantius' death. Maximianus and his son Maxentius declared themselves emperors. However, Maxentius had real power, and in 308 Maximian rebelled against his son, but failed. In 310 Maximianus again tried to gain power by rebelling against Constantine, but this defeated Maximianus and captured him. Maximianus died in 310.

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