Complex sentence: By May 28, he was in reserve; later in 1940, he was given command of the 179th Division, but in January 1942 he was again relegated to reserve or administrative posts and never again commanded front-line troops.
Split into simpler sentences: By May 28, he was in reserve; later in 1940, he took command of the 179th Division. Beginning in January 1942, he was relegated to reserve or administrative posts and never again commanded front-line troops.