Complex sentence: Ekeblad discovered how to make flour and alcohol out of potatoes and thereby made potatoes, a plant introduced in Sweden in 1658 but until then only cultivated in the greenhouses of the aristocracy, a part of the basic food supply.
Split into simpler sentences: Ekeblad discovered how to make flour and alcohol out of potatoes. She thereby made potatoes, a plant introduced in Sweden in 1658 but until then only cultivated in the greenhouses of the aristocracy, a part of the basic food supply.