Simplify the following text for a Grade 10 native English-speaking person.
Original: Emaar Properties announced on 9 June 2008 that construction of Burj Khalifa was delayed by upgraded finishes and would be completed only in September 2009 .
Simplified: Emaar Properties said on 9 June 2008 that construction of Burj Khalifa was delayed by upgraded finishes by September 2009 .