Simplify the following text for a Grade 8 native English-speaking person.
Original: One of the more well-known stories about Sun Tzu , taken from the Shiji , illustrates Sun Tzu 's temperament as follows : Before hiring Sun Tzu , the King of Wu tested Sun Tzu 's skills by commanding him to train a harem of 180 concubines into soldiers .
Simplified: : This article is about the military strategist Sun Tzu . For the mathematician of the same name , see Sun Tzu ( mathematician ) .