Complex sentence: In 1955, Sapporo Village was merged into Sapporo City, and in 1972, Sapporo was listed as one of the cities designated by government ordinance, which enabled Higashi-ku to be established.
Split into simpler sentences: In 1955, Sapporo Village was merged into Sapporo City. In 1972, Sapporo was listed as one of the cities designated by government ordinance, which enabled Higashi-ku to be established.