Original sentence: Jemdet Nasr is the type site of an Early Bronze Age culture of southern Mesopotamia, the Jemdet Nasr Period, which flourished around the 30th century BC
Edited sentence: Jemdet Nasr is the type site of an Early Bronze Age culture of southern Mesopotamia, the Jemdet Nasr period (or Uruk III period), which dates to around the 30th century BC