Complex sentence: On October 3 1903 the coat of arms of Iceland was changed to a white falcon on a blue shield, and the first version of the "landvætta" insignia became official on February 12 1919.
Split into simpler sentences: On October 3 1903 the coat of arms of Iceland was changed to a white falcon on a blue shield. It remained in use until the first version of the "landvætta" insignia became official on February 12 1919.