Complex sentence: In 1817, Cholmondeley was elected to the House of Commons for Castle Rising, a seat he held until 1821, when he was called to the House of Lords through a writ of acceleration in his father's junior title of Baron Newburgh.
Split into simpler sentences: In 1817, Lord George was elected to the House of Commons for Castle Rising, a seat he held until 1821. In 1821, Lord George was called to the House of Lords through a writ of acceleration in his father's junior title of Baron Newburgh.