The image below shows part of the list of simplified Chinese characters introduced by the Republic of China Department of Education in 1935. They were retracted in 1936, so China continued to use traditional characters until the People's Republic of China made simplified characters official in the 1950s.
What are the official reasons for the retraction?
Side note for those unfamiliar with Chinese characters: It is interesting to note that many of the simplifications introduced by the Republic of China (ROC) are similar to those eventually introduced by the People's Republic of China (PRC), because many of the simplifications have already existed as variant characters. Relative to the current simplified characters in use, the ROC simplifications appear to be more conservative both in stroke reduction, and in the number of characters being simplified (about 300 characters).