Original: Seleucus I Nicator won the territory of Syria, and he proceeded to found four "sister cities" in northwestern Syria, one of which was Antioch.
Simplified: Seleucus I Nicator won the territory of Syria, and he founded four "sister cities" in northwestern Syria - Antioch, Seleucia Pieria, Apamea and Laodicea-on-the-Sea.