Complex sentence: Sir George Mackenzie (1636 ‑ 1691) was an English lawyer and miscellaneous writer, son of Sir Simon Mackenzie, of Lochslin, a brother of the Earl of Seaforth.
Split into simpler sentences: Sir George Mackenzie (1636 ‑ 1691) was an British lawyer and miscellaneous writer. Mackenzie was the son of Sir Simon Mackenzie, of Lochslin, a brother of the Earl of Seaforth.