Complex sentence: No national airline existed, and none of the regional airlines was able to negotiate with Imperial Airways for trans-Atlantic routes; one feasible route with aircraft of the time would run from New York to Newfoundland to Ireland to London, bypassing Canadian territory completely.
Split into simpler sentences: No national airline existed, and none of the regional airlines was able to negotiate with Imperial Airways for trans-Atlantic routes. One route, feasible with the aircraft of the time, would run from New York to Newfoundland to Ireland to London, bypassing Canadian territory completely.