Complex sentence: The Battle of Tupelo (also known as the Engagement at Harrisburg) was a battle of the American Civil War fought from July 14 to 15,1864, near Tupelo, Mississippi.
Split into simpler sentences: The Battle of Tupelo (also known as the Battle of Harrisburg) was a battle of the American Civil War. It was fought from July 14 to 15,1864, near Tupelo, Mississippi.