Complex sentence: Carrefour opened in 2007 the first store at Megamall shopping center, merging later with a local supermarket named Mercadefam, the chain now has seven stores in the city.
Split into simpler sentences: Carrefour opened in 2007 the first store at Megamall, merging later with a local supermarket named Mercadefam. The chain now has seven stores in the city.