Complex sentence: During the World War, they innovated alternative ingredients and baking techniques, such as using corn flour as a percentage substitute to compose a mix of flour (s) for bread and other bakery goods like pretzels.
Split into simpler sentences: During the World War, they innovated alternative ingredients and baking techniques. One alternative included using corn flour as a percentage substitute to create a mix of flour (s) for bread and other bakery goods like pretzels.