Complex sentence: Despite this, on December 10,2004, DHL/ABX Air announced that it had chosen March as its preferred site, and December 15,2004, DHL signed a 16-year joint-use agreement with the March Joint Powers Authority.
Split into simpler sentences: Despite this, on December 10,2004, DHL/ABX Air announced that it had chosen March as its preferred site. The following Wednesday, DHL signed a 16-year joint-use agreement with the Joint Powers Authority.