Complex sentence: Two 1,600 gallon rain cisterns and a filtering system make the Brock Environmental Center the first project in the continental United States to receive a commercial permit for drinking filtered rainwater in accordance with the federal drinking water requirements.
Split into simpler sentences: Two 1,600 gallon rain cisterns and a filtering system make the Brock Environmental Center the first project in the United States to receive a commercial permit for drinking filtered rainwater. The commercial permit was given in accordance with the federal drinking water requirements.