"この世界で最も確保するのが難しいのはシンプルさであり、それは経験の最終的な境界であり、天才の最終的な努力である。"

Simplified Meaning:

Creating something simple is very hard to do. When people learn a lot and gain much experience, they often discover that making things simple is the hardest and most important task. Think about how complicated some instructions or designs can be. A genius or expert, after much practice and learning, aims to make things easy to understand and use. Imagine a smartphone. The people who design it work really hard to make it user-friendly so that anyone can use it without any confusion. That’s simplicity – lots of hard work to make something so easy to use. So, if you are trying to solve a problem or create something, remember that making it simple might take a lot of effort, but it will be worth it in the end because it helps everyone understand and use it easily.