Complex sentence: The Independent Authority of Spanish Fiscal Responsibility (AIReF) is an independent entity of fiscal control created in 2013 by the Spanish Government as an initiative of the European Union with a constitutional mandate.
Split into simpler sentences: The Independent Authority of Spanish Fiscal Responsibility ("Autoridad Independiente de Responsabilidad Fiscal española", AIReF) is an independent body for fiscal control in Spain. It was created in 2013 by the Spanish Government, on the initiative of the European Union and to implement a constitutional mandate.