Complex sentence: On July 5,2007 the runway previously designated 9R-27L became runway 10--28, and on August 30,2007, runway 9L/27R became 9R/27L.
Split into simpler sentences: On July 5,2007 the runway previously designated 9R-27L became runway 10--28. On August 30,2007, runway 9L/27R became 9R/27L.