Complex sentence: Muhammad Naeem, is a Pakistani scientist and a nuclear scientist who is the current chairman of the Pakistan Atomic Energy Commission (PAEC), and current chairman of the Board of Governors of Pakistan Institute of Engineering and Applied Sciences (PIEAS).
Split into simpler sentences: Muhammad Naeem, is a Pakistani nuclear scientist who is the current chairman of the Pakistan Atomic Energy Commission (PAEC). He is also the current chairman of the Board of Governors of Pakistan Institute of Engineering and Applied Sciences (PIEAS).