Complex sentence: It's part of the group of companies Eletrobras and has 30 years working on research and development (R&D) related to the electric power generation, transmission and distribution being considered the greatest research center on electric power of the Southern Hemisphere.
Split into simpler sentences: It's part of the Eletrobras group of companies and has for 30 years worked on research and development (R&D) related to electric power generation, transmission and distribution. It is considered the greatest research center on electric power of the Southern Hemisphere.