The design is a 'triumph' of simplicity. [=the design is very good and simple]
They celebrated their 'triumph' with a parade through the steets of the city.
They were able to achieve an important 'triumph' against their chief rivals.
(..) Were you glad to see me or not? So the Schuzburgs asked us to dinner. The sauce was said to have cost a thousand rubles, and it was ghastly. I gave them a sauce that cost kopeks and it was a triumph. This must stop. You make me feel as if I were guilty of something. What do you want me to do? (..)2012 Anna Karenina