Complex sentence: On 15 January 2013 horse meat was found in frozen beefburgers at several Irish and British supermarkets, including Tesco, Asda, Dunnes Stores, Lidl, Aldi and Iceland.
Split into simpler sentences: On 15 January 2013, horse meat was found in frozen beef burgers at several Irish and British supermarkets. These supermarkets included Tesco, Asda, Dunnes Stores, Lidl, Aldi and Iceland.