Complex sentence: As well as the permanent division the Indian Army also formed a number of independent brigades part of the Southern Army was the Aden Brigade stationed in the Aden Protectorate on the strategically important naval route from Europe to India.
Split into simpler sentences: As well as the permanent divisions, the Indian Army also formed a number of independent brigades. As part of the Southern Army the Aden Brigade was stationed in the Aden Protectorate on the strategically important naval route from Europe to India.