Complex sentence: The National Park Service acquired this parcel as part of their effort to commemorate two major battles of the American Civil War, the First and Second battles of Bull Run (also known as First and Second Manassas) which occurred about one year apart.
Split into simpler sentences: The National Park Service acquired this parcel as part of their effort to commemorate two major battles of the American Civil War. The First and Second Bull Run battles of Bull Run (also known as First and Second Manassas) occurred about one year apart.