Complex sentence: The Apache Scouts were part of the United States Army Indian Scouts, most of their service was during the Apache Wars up to 1886 though the last scouts retired in 1947.
Split into simpler sentences: The Apache Scouts were part of the United States Army Indian Scouts in the latter half of the 19th century. Most of their service was during the Apache Wars up to 1886 though the last scouts retired in 1947.