Complex sentence: Nam Suk Lee was walking along on day and stumbled on a martial arts book, as it turns out a Chinese translation of Sensei Gichin Funakoshi's Karate Jutsu.
Split into simpler sentences: Nam Suk Lee was stumbled on a martial arts book. As it turns out, the book was a Chinese translation of Sensei Gichin Funakoshi's Karate Jutsu.