Complex sentence: This was scheduled to be the last British Grand Prix to be held at Silverstone, before the event moved to Donington Park for the 2010 season however due to Donington being unable to raise the required funds the event will return to Silverstone for 2010.
Split into simpler sentences: This was scheduled to be the last British Grand Prix to be held at Silverstone, before the event moved to Donington Park for the 2010 season. However, due to Donington being unable to raise the required funds the event was later planned to return to Silverstone again for 2010.