Complex sentence: It is a 3.2 kilometre (or 2 mile), 11 corner circuit, the A1 Grand Prix race held on this circuit is the first international race return to South Africa since the 1993 South African Grand Prix.
Split into simpler sentences: It is a 3.2 kilometre (or 2 mile), 11 corner circuit. The A1 Grand Prix race held on this circuit was the first international motor race return to South Africa since the 1993 South African Grand Prix.