Complex sentence: China's first attempt at a manned spacecraft, Shuguang, was abandoned after years of development, but on October 15,2003, China became the third nation to develop an indigenous human spaceflight capability when Yang Liwei entered orbit aboard Shenzhou 5.
Split into simpler sentences: China's first attempt at a manned spacecraft, Shuguang, was abandoned after years of development. But on October 15,2003, China became the third nation to develop an indigenous human spaceflight capability when Yang Liwei entered orbit aboard Shenzhou 5.