The premise of patent application is novelty, creativity and practicality. In other words, no matter whether your invention is simple or complex, you can apply for a patent as long as it meets the three characteristics of a patent. And the simpler the structure, the more important it is to apply for a patent, get legal protection and prevent competitors from copying.
If you have any other questions, you can go to Zhizhuxia to learn about intellectual property rights.