Complex sentence: George Kenyon was a British architect, who worked for the city of Newcastle-upon-Tyne, for whom he designed the Newcastle Civic Centre in the 1950s, and which was completed in 1967.
Split into simpler sentences: George Kenyon was a British architect, who worked for the city of Newcastle-upon-Tyne. He designed the Newcastle Civic Centre in the 1950s, which was completed in 1967.