Complex sentence: Efforts to control the spread of malaria suffered a major setback in 1930: entomologist Raymond Corbett Shannon discovered imported disease-bearing "Anopheles gambiae" mosquitoes living in Brazil (DNA analysis later revealed the actual species to be "A. arabiensis").
Split into simpler sentences: Efforts to control the spread of malaria suffered a major setback in 1930. Entomologist Raymond Corbett Shannon discovered imported disease-bearing "Anopheles gambiae" mosquitoes living in Brazil (DNA analysis later revealed the actual species to be "A. arabiensis").