Simplify the following text for a Grade 6 native English-speaking person.
Original: On December 10 , 2009 , the organisers of the event announced that they were on schedule , with a plan to finish the circuit on July 5 , 2010 , though they admitted that their largest problem lay in finding accommodation for all Formula One staff and spectators .
Simplified: On 10 December 2009 , the organisers of the event announced that they were on schedule . They plan to be finished with the circuit on 5 July 2010 .