text: On 18 September 1975 , he was appointed Special Representative of the Secretary-General in Cyprus - a post he held until December 1977 - , when he rejoined the Peruvian Foreign Service .
simplified: On 18 September 1975 , he was appointed Special Representative of the Secretary-General in Cyprus â `` a post he held until December 1977 - , when he rejoined the Peruvian Foreign Service .