Complex sentence: The principle asserts that no two species with similar ecological niches can coexist in a stable equilibrium, meaning that when two species compete for exactly the same requirements, one will be slightly more efficient than the other and will reproduce at a higher rate as a result.
Split into simpler sentences: The principle asserts that no two species with similar ecological niches can coexist in a stable equilibrium. This means that when two species compete for exactly the same requirements, one will be slightly more efficient than the other and will reproduce at a higher rate as a result.