Complex sentence: Carl XVI Gustaf (full name: "Carl Gustaf Folke Hubertus", born 30 April 1946) is the reigning King of Sweden since 15 September 1973, succeeding his grandfather King Gustaf VI Adolf.
Split into simpler sentences: Carl XVI Gustaf (full name: "Carl Gustaf Folke Hubertus", born 30 April 1946) is the reigning King of Sweden. On 15 September 1973, he succeeded his grandfather King Gustaf VI Adolf.