I will try to explain what I mean. There are scientists that publish their professional work in a manner suitable only for the expert, and it is really difficult for a beginner to follow what they have published. But there are some of them that write their scientific work in a way that is very comprehensive. For example Leonard Euler, Lagrange, Klein all wrote in a nice way. Do you know other mathematicians that published like those I mentioned? I guess you understand what I mean. The oppositte to what I am talking about is Newton or Gauss, both are genious and discovered extremely difficult theorems but when they published something (when they did) they didn't make any effort to make thinks easy to understand for the begginer.