Complex sentence: Currently over 3 billion people live in areas at risk malaria transmission, 2012 it is estimated that there where 207 million clinical cases of malaria and, 627,00 deaths caused by malaria, most of which were children.
Split into simpler sentences: Currently over 3 billion people live in areas that are at risk for malaria transmission. In 2012 it is estimated that there where 207 million clinical cases of malaria and, 627,00 deaths caused by malaria, most of which were children.