Complex sentence: The Princess wrote the second book while she stayed in Fukushima using foodstuffs of the prefecture to create recipes and finally published the cookbook of her recipes in October 2013, with its sales donated to support Fukushima.
Split into simpler sentences: The Princess wrote the second book while she stayed in Fukushima. She produced recipes using foodstuffs of Fukushima and finally published the cookbook of her recipes in October to support Fukushima.