Complex sentence: Sir Arthur Helps HonDCL (10 July 1813--7 March 1875), English writer and dean of the Privy Council, youngest son of Thomas Helps, a London merchant, was born in Streatham in South London.
Split into simpler sentences: Sir Arthur Helps HonDCL (10 July 1813--7 March 1875) was an English writer and dean of the Privy Council. The youngest son of London merchant Thomas Helps, Arthur Helps was born in Streatham in South London.