Complex sentence: In contrast to the Tokyo Stock Exchange, which mainly deals in spot trading, the Osaka Securities Exchange's strength is in derivative products today OSE is the leading Derivatives Exchange in Japan and it was the largest futures market in the world in 1990 and 1991.
Split into simpler sentences: In contrast to the Tokyo Stock Exchange, which mainly deals in spot trading, the Osaka Securities Exchange's strength is in derivative products. The OSE is the leading Derivatives Exchange in Japan and it was the largest futures market in the world in 1990 and 1991.