Complex sentence: Dorothy's family take shelter in the storm cellar, but Dorothy and Toto run into the house where the window blew off and knocked out Dorothy where she later wakes up and finds that the house got swept up in the tornado and carried into the sky.
Split into simpler sentences: Dorothy's family take shelter in the storm cellar, but Dorothy and Toto run into the house but Dorothy is knocked unconscious. She later wakes up and finds that the house got swept up in the tornado and carried into the sky.