Complex sentence: The Legatum Prosperity Index is an annual ranking developed by the Legatum Institute of 110 countries, according to a variety of factors including wealth, economic growth, personal wellbeing, and quality of life.
Split into simpler sentences: The Legatum Prosperity Index is an annual ranking developed by the Legatum Institute of 110 countries. The ranking is based according to a variety of factors including wealth, economic growth, personal wellbeing, and quality of life.