Complex sentence: The Bajoran Militia is the military arm of the Bajoran Provisional Government which comprises (although not exhausted to) many former resistance fighters opposed to the Cardassian occupaton of Bajor.
Split into simpler sentences: The Bajoran Militia is the military arm of the Bajoran government. It is made up of (although is not limited to) many former resistance fighters opposed to the Cardassian occupation of Bajor.