Complex sentence: He married Theresa Australia Brown (née Peacock) in 1857 in Sydney, the daughter of John Jenkins Peacock (d.1866) and Maria Peacock (1804-1884).
Split into simpler sentences: He married Theresa Australia Brown (née Peacock) in 1857 in Sydney. Theresa was the daughter of John Jenkins Peacock (d.1866) and his wife Maria Peacock (1804/05-1884).