Complex sentence: He is best known for the images he created for the Campaign for Nuclear Disarmament (CND) in the 1970s-80s and has his work displayed as part of Tate Britain's permanent collection.
Split into simpler sentences: He is best known for the images he created for the Campaign for Nuclear Disarmament (CND) in the 1970s-80s. He has his work displayed as part of Tate Britain's permanent collection.