Complex sentence: The "Luftwaffe" was guaranteed air superiority over the Netherlands by sheer numerical superiority; 247 medium bombers, 147 fighters, 424 Junkers Ju 52 transports, and 12 Heinkel He 59 seaplanes to operations over the Netherlands.
Split into simpler sentences: The "Luftwaffe" was guaranteed air superiority over the Netherlands by sheer numerical superiority. They allocated 247 medium bombers, 147 fighters, 424 Junkers Ju 52 transports, and 12 Heinkel He 59 seaplanes to operations over the Netherlands.