Complex sentence: Under the Champlin Dayton Athletic Association, Andrews Park hosts various sports leagues such as summer softball, grades 1st through 12th and soccer, grades pre-k through 12th.
Split into simpler sentences: Under the Champlin Dayton Athletic Association, Andrews Park is the host of summer softball and soccer leagues. The softball league is for grades 1st through 12th and the soccer league is for grades pre-k through 12th.