Complex sentence: Khazar Sea mostly used by the Turks, Arabs and Iranians as well as the Caspian Sea often used by the Greek and Europeans.Caspian also pronounced by Arabs as Qazvin were used more frequently.
Split into simpler sentences: Khazar Sea mostly used by the Turks, Arabs and Iranians as well as the Caspian Sea often used by the Greek and Europeans. Khazar and Caspian--also pronounced by Arabs as Qazvin--were used more frequently.