Complex sentence: In 1906 the U.S. government sent Colonel William Elliot to Indianapolis to locate the mass grave, and in 1912, a monument was erected at the site to honor the 1,616 Confederate prisoners of war who were buried at Greenlawn.
Split into simpler sentences: In 1906 the U.S. government sent Colonel William Elliot to Indianapolis to locate the mass grave. In 1912 a monument was erected at the site to honor the 1,616 Confederate prisoners of war who were buried at Greenlawn.