Complex sentence: XL Airways France is a French airline with its head office in Bâtiment Mars in Continental Square II on the grounds of Charles de Gaulle Airport and in Tremblay-en-France, France.
Split into simpler sentences: XL Airways France is a French airline based at Paris-Charles de Gaulle Airport. It has its head office in Bâtiment Mars in Continental Square II on the grounds of Charles de Gaulle Airport and in Tremblay-en-France, France.