Complex sentence: Robert Nazaryan (born in 1956) is an Armenian politician, former mayor of Yerevan, currently (since 2012) chief of the Public Services Regulatory Commission of Armenia.
Split into simpler sentences: Robert Nazaryan (born in 1956) is an Armenian politician, and former mayor of Yerevan. Since 2012, Nazaryan works as the chief of the Public Services Regulatory Commission of Armenia.