Complex sentence: Drummond operates the Shoal Creek mine in northwestern part of Jefferson County in Alabama and the Pribbenow and El Descanso mines near La Loma in the Cesar Department in northern Colombia.
Split into simpler sentences: Drummond operates the Shoal Creek mine in northwestern part of Jefferson County in Alabama. It operated the Pribbenow and El Descanso mines near La Loma in the Cesar Department in northern Colombia.