Complex sentence: On December 23,1972, Noel was appointed U.S. Ambassador to Sudan, the outgoing Ambassador, George Curtis Moore, was asked to stay on as Deputy Chief of Mission until the new Deputy arrived in March.
Split into simpler sentences: On December 23,1972, Noel was appointed U.S. Ambassador to Sudan. The outgoing Ambassador, George Curtis Moore, was asked to stay on as Deputy Chief of Mission until the new Deputy arrived in March.