Complex sentence: One was the Norway based Aker Yards, created in 2004 by combining the shipbuilding activities of Aker and Kværner with the France-based Alstom shipbuilding group, which has shipyards (formerly those of Chantiers de l'Atlantique in Saint-Nazaire) and in Lorient.
Split into simpler sentences: One was the Norway based Aker Yards, created in 2004 by combining the shipbuilding activities of Aker and Kværner. Other being, France based Alstom shipbuilding group, with shipyards in Saint-Nazaire (former Chantiers de l'Atlantique) and in Lorient.