Complex sentence: Smith was born in Jordanhill, the son of the lawyer and mathematician Archibald Smith and brother to James Parker Smith MP and Arthur Hamilton Smith CB, Keeper of Greek and Roman Antiquities at the British Museum.
Split into simpler sentences: Smith was born in Jordanhill, the son of the lawyer and mathematician Archibald Smith. His brothers were James Parker Smith, later an MP, and Arthur Hamilton Smith, later Keeper of Greek and Roman Antiquities at the British Museum.