Simplify the following text for a Grade 7 native English-speaking person.
Original: `` Malaria Site : History of Malaria During Wars '' addresses the devastating impact of malaria in numerous well-known conflicts , beginning in June 323 B.C. . That site 's authors note : `` Many great warriors succumbed to malaria after returning from the warfront and advance of armies into continents was prevented by malaria .
Simplified: People who live where there is no malaria usually have not had malaria .