Complex sentence: By March 2015,3D imagery covering more than was available and by early 2016 had been expanded to hundreds of cities in over 40 countries, including every U.S. state and encompassing every continent except Antarctica.
Split into simpler sentences: By March 2015,3D imagery covering more than was available. By early 2016,3D imagery had been expanded to hundreds of cities in over 40 countries, including every U.S. state and encompassing every continent except Antarctica.