That’s rather subjective. What if some people already find your “complex” problem “simple”?
Some people do – they’re subject matter experts. However, being able to communicate this complex subject matter to people who do not know the area well is a real skill.
How many times have you been to a technical / university / research meeting, where the speaker is incredibly intelligent, but you just can’t follow what they’re talking about?
Either you’re not listening, or they haven’t keyed their presentation to the audience properly, and just dive into the detail.
The key is to know the area well, but also understand how simple the complexity can be. I find simple analogies, examples, and then building up to more complex examples being a good way to describe things.
I really don’t feel like I do much at work, but make things better for people, and easier for them to do stuff.