Complex sentence: Jethro Thomas Robinson (1829-15 July 1878) was a British architect, who specialised in theatres, and the father-in-law of the more famous theatre architect Frank Matcham.
Split into simpler sentences: Jethro Thomas Robinson (1829-15 July 1878) was a British architect, who specialised in theatres. He was the father-in-law of architect Frank Matcham.