Complex sentence: In december 1929, the Canadian Biscuit Company Ltd. sells the plot of land to the Parisian Laundry, incorporated in 1933, where the factory is erected to produce uniforms that were, at the time, being sold to the most prestigious hotels in Montreal.
Split into simpler sentences: In december 1929, the Canadian Biscuit Company Ltd. sells the plot of land to the Parisian Laundry. Incorporated in 1933, Parisian Laundry builds the factory to produce uniforms which were, at the time, sold to the most prestigious hotels in Montreal.