Complex sentence: Remote ischemic conditioning is a medical procedure to reduce the incidence of heart disease and stroke, the leading causes of death worldwide, and since 1990, more people have died from cardiovascular disease than any other cause.
Split into simpler sentences: Remote ischemic conditioning is a medical procedure to reduce the incidence of heart disease and stroke, the leading causes of death worldwide. Since 1990, more people have died from cardiovascular disease than any other cause.