Complex sentence: During the 2003 invasion of Iraq, all 3 Ranger Battalions were assigned to Task Force 20, it was based on the concept of TF Sword/11, its task was to seize key locations, long distance Special Reconnaissance and capturing HVTs.
Split into simpler sentences: During the 2003 invasion of Iraq, all 3 Ranger Battalions were assigned to a new Task Force. It was based on the concept of a prior successful Task Force, and its task was to seize key locations, long distance Special Reconnaissance and capturing HVTs.