Complex sentence: Brigades formed into divisions are usually infantry or armoured (sometimes referred to as combined arms brigades), in addition to combat units they may include combat support units or sub-units such as artillery and engineers, and logistic units or sub-units.
Split into simpler sentences: Brigades formed into divisions are usually infantry or armoured (sometimes referred to as combined arms brigades). In addition to combat units, they may include combat support units or sub-units, such as artillery and engineers, and logistic units or sub-units.