Complex sentence: After more than forty years of inactivation, the group was activated again as part of the 509th Bomb Wing and designated the 509th Operations Group, conducting the combat and training operations of the B-2 Spirit bomber.
Split into simpler sentences: After more than forty years of inactivation, the unit was activated again as the 509th Operations Group. A current unit of the United States Air Force, it is part of the 509th Bomb Wing, conducting the combat and training operations of the B-2 Spirit bomber.