Simplify the following text for a Grade 7 native English-speaking person.
Original: The Donbass arena was completed ahead of schedule , but the grand opening was delayed until 29 August 2009 to coincide with the Ukrainian holiday of Miners Day , as well as Donetsk City day . Donetsk is in the Donbass region , a mining region , and the date was chosen for its symbolism .
Simplified: Donbass Arena is a football stadium in Donetsk in Ukraine .