Complex sentence: The station was slated to begin service in the fall of 2005, but testing and commissioning of the station and related facilities lasted into the fall of 2005, with trial running of trains starting in mid-November.
Split into simpler sentences: The station was slated to begin service in the fall of 2005. Test and commissioning of the station and related facilities has been underway in fall 2005, with trial running of trains starting in mid-November.