Complex sentence: King Juan Carlos of Spain, through his Minister, granted the succession of the dukedom to Douro by Royal Decree on 21 May 2010, reported officially in the "Official State Gazette" for 12 June 2010.
Split into simpler sentences: King Juan Carlos of Spain, through his Minister, granted the succession of the dukedom to Douro on 21 May 2010. Reported officially in the "Official State Gazette" for 12 June 2010.