Complex sentence: Abdulaziz bin Salman began his career as a lecturer at King Fahd University of Petroleum and Minerals, followed by a period as an acting director of the research institute there, dealing with energy studies.
Split into simpler sentences: Abdulaziz bin Salman started his career as a lecturer at King Fahd University of Petroleum and Minerals. Then he worked as an acting director of the research institute there, dealing with energy studies.