Complex sentence: The Institut Pasteur in Ho Chi Minh City is a Vietnamese national institute initially created by the French in 1891 under the name Pasteur Institute-Sai Gon, in 1975 renamed the Institute of Epidemiology, and in 1991 given the current name.
Split into simpler sentences: The Institut Pasteur in Ho Chi Minh City is a Vietnamese national institute. It was created by the French in 1891 under the name Pasteur Institute-Sai Gon, later in 1975 was named the Institute of Epidemiology, and finally in 1991 adopts the current name.