"High food prices have hit hard the World Food Programme's capacity to respond to hunger" , in terms of operational costs ( up 40% since June 2007 ) , said Ms Sheeran , adding that these high prices are also "likely to increase the incidence and depth of food insecurity" .
The above sentence is very complicated. Please provide me a simplified synonymous version consisting of multiple sentences:
High food prices have taken a heavy toll on the World Food Program's ability to respond to hunger , in terms of operational costs which are up 40% since June 2007 , said Ms . Sheeran . These high prices risk "increasing the frequency and severity of food insecurity , " she added .