Complex sentence: Cleanup of the mining wastes at the Buckeye-Enterprise, Crystal and Bullion mines in the Basin Creek and Cataract watersheds was completed in 2002, and the removal of mine waste from Basin was completed in 2004.
Split into simpler sentences: Cleanup of the mining wastes at the Buckeye-Enterprise, Crystal and Bullion mines in the Basin Creek and Cataract watersheds was completed in 2002. The removal of mine waste from Basin was completed in 2004.