Complex sentence: He became City Architect and City Building Surveyor in 1889, a position he held until 1897, when he was appointed Principal Assistant Architect to Walter Liberty Vernon in the Government Architect's Branch.
Split into simpler sentences: He became City Architect and City Building Surveyor in 1889. He held this position until 1897, when he was appointed Principal Assistant Architect to Walter Liberty Vernon in the Government Architect's Branch.