Complex sentence: Great Mall of the Great Plains opened with 150 stores laid out in a half-mile "racetrack"; the mall was also billed at the time as the largest outlet mall in the state of Kansas.
Split into simpler sentences: Great Mall of the Great Plains opened with 150 stores, all laid out in a half-mile "racetrack". The mall was also billed at the time as the largest outlet mall in the state of Kansas.