What do you mean by "five generations" opening China and "Yan Huang" jointly opening China?

The meaning of this sentence is "five families opened up China, and the people of China jointly opened up China";

During the Five Dynasties, China began to develop, which means that the history of civilization in China began to develop. Yanhuang refers to the legendary ancient emperors in China, who represent the history and culture of the Chinese nation. Yan and Huang jointly created China, which means that Yan and Huang jointly created Chinese civilization and became an important symbol of Chinese history and culture.

Generally speaking, the phrase "China was opened in the Five Dynasties, and China was jointly opened by Yan and Huang" means that the history of China civilization began in the Five Dynasties, and the Yan and Huang emperors jointly opened the civilization of China and became an important symbol of China's history and culture.