Complex sentence: An international architectural competition was held in 2007--2008 for the design of Virgin Galactic's operating base, Spaceport America in New Mexico, with the contract awarded to URS and Foster + Partners architects.
Split into simpler sentences: An international architectural competition was held in 2007--2008 for the design of Virgin Galactic's operating base, Spaceport America in New Mexico. The contract was awarded to URS and Foster + Partners architects.