Simplify the following text for a Grade 6 native English-speaking person.
Original: It replaces the first-generation Lego Mindstorms kit , which was called the Robotics Invention System . The base kit ships in two versions : the Retail Version ( set # 8527 ) and the Education Base Set ( set # 9797 ) .
Simplified: The available versions are : Lego Mindstorms NXT 1.0 ( set # 8527 ) , Lego Mindstorm NXT 2.0 ( set # 8547 ) and Lego Mindstorms Education NXT ( set # 9797 ) .