Complex sentence: The shell supplier, Kraft Foods, recalled the products in question, having bought the shells from a Sabritas plant in Mexicali which used flour supplied from an Azteca mill plant in Plainview, Texas.
Split into simpler sentences: The shell supplier, Kraft foods, recalled the products in question. Kraft had bought the shells from a Sabritas plant in Mexicali which used flour supplied from an Azteca mill plant in Plainview, Texas.