Complex sentence: Lower capacity 110 kV, 66 kV and 50 kV transmission lines connect smaller towns and cities and smaller power stations, and are connected to the 220 kV core grid through points of interconnection at major transmission substations.
Split into simpler sentences: Lower capacity 110 kV, 66 kV and 50 kV transmission lines connect smaller towns and cities and smaller power stations to the main grid. The lower voltage transmission lines are connected to the 220 kV core grid through points of interconnection at major transmission substations.