Complex sentence: Northrop Grumman and EADS have described reports of flight control problems and high costs for certification as "inaccurate"; they have stated their intention to provide an affordable plan to complete the first EuroHawk's flight testing and produce the remaining four aircraft.
Split into simpler sentences: Northrop Grumman and EADS described the reports of flight control problems and high costs for certification as "inaccurate". The contractors stated they will provide an affordable plan to complete the first EuroHawk's flight testing, and produce the remaining four aircraft.