Complex sentence: This evaluation can therefore drive adaptive evolution and divergence (when the traits underlying the fitness differences between the evaluated units are heritable), and for this reason the unit of selection has been a debated topic among evolutionary biologists.
Split into simpler sentences: This evaluation can therefore drive adaptive evolution and divergence (when the traits underlying the fitness differences between the evaluated units are heritable). For this reason, the unit of selection is a debated topic among evolutionary biologists.