Complex sentence: J.I. Rodale, who founded "Organic Gardening and Farming" magazine got his introduction to organic gardening at Borsodi's Dogwood Acres Homestead, as did the Keene family, founders of Walnut Acres organic food catalog.
Split into simpler sentences: J.I. Rodale, who founded "Organic Gardening and Farming" magazine got his introduction to organic gardening at Borsodi's Dogwood Acres Homestead. Also the Keene family founders of Walnut Acres organic food catalog.