Complex sentence: Modern archaeological work began in 1948 when Kültepe was excavated by a team from the Turkish Historical Society and the General Directorate of Antiquities and Museums led by Tahsin Özgüç until his death in 2005.
Split into simpler sentences: Modern archaeological work began in 1948 when Kültepe was excavated by a team from the Turkish Historical Society and the General Directorate of Antiquities and Museums. The team was led by Tahsin Özgüç until his death in 2005.