Complex sentence: On 4 December 1522 Surrey was made Lord Treasurer upon his father's resignation of the office, and o 21 May 1524 he succeeded his father as 3rd Duke of Norfolk.
Split into simpler sentences: On 4 December 1522 Surrey was made Lord Treasurer upon his father's resignation of the office. On 21 May 1524 he succeeded his father as 3rd Duke of Norfolk.