Complex sentence: After his father's death in 1953, he became head of the House of Hanover, usually styled "His Royal Highness the Prince of Hanover" and sometimes as "Ernest Augustus IV".
Split into simpler sentences: After his father's death in 1953, he became head of the House of Hanover. He was usually styled "His Royal Highness The Prince of Hanover" and sometimes as "Ernest Augustus IV".