Complex sentence: Various alternate theories have arisen to speculate about the origins of HIV/AIDS, ranging from suggestions that AIDS was the inadvertent result of experiments in the development of vaccines, to claims that human immunodeficiency virus was developed by scientists working for the U.S. government.
Split into simpler sentences: Various alternate theories have arisen to speculate about the origins of HIV/AIDS. These alternative ideas range from suggestions that AIDS was the inadvertent result of experiments in the development of vaccines, to claims that human immunodeficiency virus was developed by scientists working for the U.S. government.