Complex sentence: He has commanded an Armoured Regiment and later as a Brigadier, he commanded a Mountain Brigade in an insurgency affected area and was awarded the Ati Vishisht Seva Medal for distinguished service.
Split into simpler sentences: He has commanded an Armoured Regiment and also a Mountain Brigade in an insurgency affected area. The latter as a Brigadier; he was awarded the Ati Vishisht Seva Medal for distinguished service.