Complex sentence: The Perry chain, which at the time comprised 224 stores, was the largest acquisition ever made by Rite Aid; this acquisition also brought the Rite Aid name to the Detroit area for the first time.
Split into simpler sentences: The Perry chain, which at the time comprised 224 stores, was the largest acquisition ever made by Rite Aid. In addition, this acquisition brought the Rite Aid name to the Detroit area for the first time.