Complex sentence: In 1992, the owners of Hagkaup, the leading domestic retailer, acquired 50% of shares in Bonus, and in 1993, Hagkaup and Bónus established a joint purchasing company named Baugur.
Split into simpler sentences: In 1992, the owners of Hagkaup, the leading domestic retailer, acquired 50% of shares in Bonus. In 1993, Hagkaup and Bónus established a joint purchasing company named Baugur.