Complex sentence: Empress Eugenie highly valued Worth's creations; she constantly had him on call in order to make a dress for each event, unspokenly creating the rule of no woman should wear the same thing twice.
Split into simpler sentences: Empress Eugenie highly valued Worth's creations; and constantly had him on call in order to make a dress for every event. With Worth's help, she unspokenly creating the rule that no woman should wear the same thing twice.