Complex sentence: Recovered and imprisoned, he effected an escape back to Union forces, apparently resigning his commission but was on 1 August 1863 commissioned a Brigadier General by Abraham Lincoln of a volunteer group, commanding a post at Miliken's bend on the Mississippi.
Split into simpler sentences: Recovered and imprisoned, he effected an escape back to Union forces and resigning his commission. On August 1,1863 he was commissioned a Brigadier General of Volunteers by President Abraham Lincoln; commanding a post at Miliken's Bend on the Mississippi.