Complex sentence: As he waited to be exchanged, he was commissioned a colonel in the Confederate States Army on June 11,1861, and after arriving in Memphis, Tennessee set about recruiting for and organizing the 1st Missouri Infantry.
Split into simpler sentences: As he waited to be exchanged, he was commissioned a colonel in the Confederate States Army on June 11,1861. After arriving in Memphis, Tennessee he set about recruiting for and organizing the 1st Missouri Infantry.