Complex sentence: In the 1980s, the company diversified and ventured into the supermarket and home appliance store business, then finally opening the first "Supermall" store in 1985 in Quezon City called SM City North EDSA.
Split into simpler sentences: In the 1980s, the company diversified and ventured into the supermarket and home appliance store business. It opened the first "Supermall" store in 1985 in Quezon City called SM City North EDSA.