Original sentence: His theories are not widely supported by mainstream astronomers.Hoagland (born April 25, 1945) is a proponent of fringe theories on astronomical topics, as well as a number of conspiracy theories connected to the space program
Edited sentence: Hoagland (born April 25, 1945) is a proponent of theories on astronomical topics, as well as a number of conspiracy theories connected to the space program.While his theories are not widely supported by mainstream astronomers, he has made many predictions outside of mainstream astronomical thought which have later been verified by mainstream scientific observation, suggesting his ideas have some validity