Perhaps you should learn to write clear and concise English?
Or they had done as much R&D as they could and still not solved the problems.
Here's the concise version for the reading challenged:
Canon, the world's most renowned and profitable camera company cannot solve sensor heating dissipation problems with full frame 4K in its latest cameras due to sensor technology limitations while technologically more advanced competitors Sony and Nikon seem to have success in this area.
That read right to you?