Complex sentence: While commercially canned goods are required to undergo a "botulinum cook" in a pressure cooker at for 3 minutes, and so rarely cause botulism, there have been notable exceptions such as the 1978 Alaskan salmon outbreak and the 2007 Castleberry's Food Company outbreak.
Split into simpler sentences: While commercially canned goods are required to undergo a "botulinum cook" in a pressure cooker at for 3 minutes, and thus rarely cause botulism, there have been notable exceptions. Two were the 1978 Alaskan salmon outbreak and the 2007 Castleberry's Food Company outbreak.