It is wrong to consider that the more difficult the papers are, the more valuable. We should write a paper in a top-down manner, starting from the central idea that explains the originality of the paper down to the details.
In the abstract, we should state the originality, the new approach, and the contribution of the paper. In the introduction, we should explain the problems of the previous work citing references and explain what is the originality of the paper and how to solve the problems in a new way. In the body of the paper, we should discuss the idea more elaborately, if possible, using figures and then move to the details. In the conclusions, we should state the method and contribution clearly.
In presenting a paper, we should explain the idea by figures not resorting to mathematical equations.