Complex sentence: In the 6th century, Emperor Anastasius I (r.491-518) emptied the basin using hydraulic machines, building a mole and dredging the sandy ground, and Emperor Justinian moved in the new harbor part of the traffic of the "Neorion" port.
Split into simpler sentences: In the 6th century, Emperor Anastasius I (r.491-518) emptied the basin using hydraulic machines, built a mole and dredged the sandy ground,. Later, Emperor Justinian moved in the new harbor part of the traffic of the "Neorion" port.