Complex sentence: His botched attempt to assassinate the Empress Dowager led him to flee first to Japan, where he was much impressed with the advanced state of modernization, and then to Great Britain, where he enrolled at University of Edinburgh.
Split into simpler sentences: His botched attempt to assassinate the Empress Dowager led him to flee. He went first to Japan, where he was much impressed with the advanced state of modernization, and then to Great Britain, where he enrolled at University of Edinburgh.