Complex sentence: Its reputation earned it clients across society--it made shoes for actress and Edward VII's mistress Lillie Langtry; later it made shoes for Queen Mary, who awarded the company the first of its three Royal Warrants.
Split into simpler sentences: Its reputation earned it clients across society--it made shoes for actress and Edward VII's mistress Lily Langtry. Later it made shoes for Queen Mary, who awarded the company the first of its three Royal Warrants.