Complex sentence: The Bak-Sneppen model is a simple model of co-evolution between interacting species developed to show how self-organized criticality may explain key features of the fossil record such as the distribution of sizes of extinction events and the phenomenon of punctuated equilibria.
Split into simpler sentences: The Bak-Sneppen model is a simple model of co-evolution between interacting species. It was developed to show how self-organized criticality may explain key features of the fossil record, such as the distribution of sizes of extinction events, and the phenomenon of punctuated equilibria.