Original: Uruk is eponymous of the Uruk period, the protohistoric Chalcolithic to Early Bronze Age period in the history of Mesopotamia spanning c. 4000 to 3100 BC, succeeded by the Jemdet Nasr period of Sumer proper.
Simplified: Uruk gives its name to the Uruk period, the protohistoric Chalcolithic to Early Bronze Age period in the history of Mesopotamia, about 4000 to 3100 BC. This was followed by the Jemdet Nasr period of Sumer proper.