Complex sentence: In 1959, Ellington was downgraded to a reserve Air Force base, and has served the military in that capacity since; the Civil Air Patrol moved its headquarters from Bolling Air Force Base to Houston the same year.
Split into simpler sentences: In 1959, Ellington was downgraded to a reserve Air Force base, and has served the military in that capacity since. The Civil Air Patrol moved its headquarters from Bolling Air Force Base to Houston the same year.