Complex sentence: Hipermart is a Mexican hypermarket (supermarket) chain owned by Organización Soriana, and it opened the first stores in 1989 (San Pedro and Cumbres in Monterrey, and San Lorenzo in Ciudad Juárez).
Split into simpler sentences: Hipermart is a Mexican hypermarket (supermarket) chain owned by Organización Soriana. The chain it opened the first stores in 1989 (San Pedro and Cumbres in Monterrey, and San Lorenzo in Ciudad Juárez).