Complex sentence: These responsibilities are carried out by 6 regions, Atlantic, Quebec, Ontario, Prairie & Northern, Pacific and the sixth region based in Ottawa (National Capital Region) is responsible for air operators operating international flights and certain types of large aeroplanes.
Split into simpler sentences: These responsibilities are carried out by 6 regions, Atlantic, Quebec, Ontario, Prairie & Northern and Pacific. The other region based in Ottawa (National Capital Region) is responsible for air operators operating international flights and certain types of large aeroplanes.