Simple and clear; concise and easy to understand.
説明が簡単明瞭だったので、すぐに理解できた。
The explanation was simple and clear, so I understood it immediately.
マニュアルは簡単明瞭に書かれているため初心者にも優しい。
The manual is written simply and clearly, so it's beginner-friendly.
この方法なら作業が簡単明瞭に進む。
With this method, the task proceeds simply and clearly.