Complex sentence: The energy portion of CEP consisted mainly of Canadian workers in the oil, gas and chemical sectors, while the paperworkers portion of CEP consisted of pulp and paper workers in the Maritimes, Quebec, Ontario, Alberta and British Columbia.
Split into simpler sentences: The energy portion of CEP consists mainly of Canadian workers in the oil, gas and chemical sectors. The paperworkers portion of CEP consists of pulp and paper workers in the Maritimes, Quebec, Ontario, Alberta and British Columbia.