Complex sentence: The Central and Ecclesall constituencies were abolished in 1950 in favour of two new constituencies, Heeley and Neepsend, but the latter was abolished in 1955 and the former was replaced by a revived Central constituency in 1983.
Split into simpler sentences: The Central and Ecclesall constituencies were abolished in 1950 and two new constituencies, Heeley and Neepsend, created. Neepsend was short-lived, being abolished by 1955, and Park was abolished, to be replaced by a revived Central constituency in 1983.