Complex sentence: Other structures are possible, such as a pentomic division, where the division commander controls five maneuver elements, which was used in the United States Army in the late 1950s, and regiments were replaced by combined arms battlegroups.
Split into simpler sentences: Other structures are possible, such as a pentomic division, where the division commander controls five maneuver elements. This was used in the United States Army in the late 1950s, and regiments were replaced by combined arms battlegroups.