Complex sentence: The 2nd Iowa Infantry Regiment fought throughout the course of the War, organized in the spring of 1861 in Keokuk, Iowa, with the regiment finally mustered out in July, 1865 in Louisville, Kentucky.
Split into simpler sentences: The 2nd Iowa Infantry Regiment fought throughout the course of the war. It was organized in the spring of 1861 in Keokuk, Iowa, with the regiment finally mustered out in July 1865 in Louisville, Kentucky.