Complex sentence: Archibald Primrose, Lord Dalmeny (2 October 1809--23 January 1851) was a Scottish Liberal politician, the eldest son of Archibald Primrose, 4th Earl of Rosebery and Harriett Bouverie.
Split into simpler sentences: Archibald Primrose, Lord Dalmeny (2 October 1809--23 January 1851) was a Scottish Liberal politician. He was the eldest son of Archibald Primrose, 4th Earl of Rosebery by his wife Harriett Bouverie.