Give the reader a way to look closer.
“I make complicated things simple” could describe a designer, an engineer or an architect. It tells a reader what you value. It leaves them wondering what you actually did.
One useful next sentence names a decision. An engineer might explain a retry policy. An architect might show how a section changed the light in a room. A creative director might show the edit that made a campaign idea hold together.
The example separates a contribution, an inspectable check and an unmeasured outcome. It gives you something more useful to discuss than an adjective, without making a claim the evidence cannot support.
The evidence will look different in every profession. In the architecture guide, that means authorship and project development. In creative direction, it means the idea, decisions and collaborators. For an engineer, the portfolio evidence answer connects the account to code, tests and a usable entry point.
Let the application carry the same account.
A website can hold the fuller story. A résumé selects what matters to one opportunity. A cover letter explains a connection the reader might otherwise miss. They should agree on the facts even when they use different amounts of detail.
Start with the decision you face now, then return to the work behind it.