Complex sentence: Condé Nast bought Fairchild Publications from its previous owner, The Walt Disney Company, on December 1,1999, which brought over magazines to Condé Nast that included "Details", "Women's Wear Daily", and "W".
Split into simpler sentences: Condé Nast bought Fairchild Publications from its previous owner, The Walt Disney Company, on December 1,1999. This purchase brought over magazines to Condé Nast that included "Details", "Women's Wear Daily", and "W".