Complex sentence: In addition it's imperative that food--especially grain, sugar and flour--is kept in plastic or metal storage containers with tight fitting lids, this will stop flour moths and other pests from getting at their contents.
Split into simpler sentences: In addition it is imperative that food--especially grain, sugar and flour--is kept in plastic or metal storage containers with tight fitting lids. This will stop flour moths and other pests from getting at their contents.