Complex sentence: Within a year of opening, Eugène Rimmel came to create many make-up products including his best-known: mascara, giving rise to the term'rimmel' being used to mean'mascara' in many Mediterranean languages.
Split into simpler sentences: Within a year of opening, Rimmel came to create many make-up products including his best-known mascara. It gave rise to the term'rimmel' being used to mean'mascara' in many Mediterranean languages.