Original sentence: A system of romanization invented by the Chinese, pinyin has long been widely used on street and commercial signs as well as in elementary Chinese textbooks as an aid in learning Chinese characters.Government and United Nations also adopted the pinyin system for all names of Chinese people and places.On January 1, 1979, the PRC Government officially adopted the hanyu pinyin system for spelling Chinese names and places in Roman letters.Pinyin replaced other conventional spellings in the PRC's English-language publications
Edited sentence: :category:demographics by country.A system of romanization invented by the Chinese, pinyin has long been widely used in mainland China on street and commercial signs as well as in elementary Chinese textbooks as an aid in learning Chinese characters.Government and United Nations also adopted the pinyin system for all names of people and places in mainland China.On January 1, 1979, the PRC Government officially adopted the hanyu pinyin system for spelling Chinese names and places in mainland china in Roman letters.Pinyin replaced other conventional spellings in mainland China's English-language publications