Complex sentence: Several reasons have been cited for the job losses such as the high dollar, high energy prices and overseas competition; a challenge that North America has had to learn to deal with, not just Hamilton, Ontario.
Split into simpler sentences: Several reasons have been cited for the job losses such as the high dollar, high energy prices and overseas competition. This is a problem and a challenge that all of North America has had to learn to deal with, not just Hamilton, Ontario.