Complex sentence: Fermat's little theorem, Euler's theorem, Lagrange's theorem, each of which is stronger than the last; another is that a sharp upper bound (see above) is a stronger result than a non-sharp one.
Split into simpler sentences: Fermat's little theorem, Euler's theorem, Lagrange's theorem, each of which is stronger than the last. Also, a sharp upper bound (see the previous entry) is a stronger result than a non-sharp one.