Complex sentence: Similar ideas were developed in the 1970s by gastroenterologist Walter Voegtlin, which was later developed by Stanley Boyd Eaton and Melvin Konner, and popularized by Loren Cordain in his 2002 book "The Paleo Diet".
Split into simpler sentences: Similar ideas were developed in the 1970s by gastroenterologist Walter Voegtlin. The idea was later developed by Stanley Boyd Eaton and Melvin Konner, and popularized by Loren Cordain in his 2002 book "The Paleo Diet".