Complex sentence: After the founding of the People's Republic of China, Gongyi was placed under the jurisdiction of Zhengzhou but came under the control of Kaifeng in January 1955 before reverting to Zhengzhou in August 1983.
Split into simpler sentences: After the founding of the People's Republic of China, Gongyi was placed under the jurisdiction of Zhengzhou. In January, 1955, it came under the control of Kaifeng before reverting to Zhengzhou in August 1983.