Complex sentence: Metro renamed the Artesia Transit Center to the Harbor Gateway Transit Center during December 2011 but has not completed the process of renaming the station; the recently installed metro pylon sign displays the station's name as Artesia Transit Center.
Split into simpler sentences: Metro renamed the Artesia Transit Center to the Harbor Gateway Transit Center during December 2011 but it has not fully done of the process of renaming the station. The recently installed metro pylon sign displays the station's name as Artesia Transit Center.