Complex sentence: At age 12, he became Duke of Königsblau after his older brother refused to carry on with the title he inherited from his grand-mother Duchess Elsa of Königsblau after her passing away on 1994.
Split into simpler sentences: At age 12, he became Duke of Königsblau after his older brother refused to carry on with the title. He inherited from his grand-mother Duchess Elsa of Königsblau after her passing away on 1994.