Complex sentence: The Diavik mine was unable to truck in all the supplies needed for the rest of 2006 before the road closed and arrangements had to be made to bring the remainder of the supplies in by air.
Split into simpler sentences: The Diavik mine was unable to truck in all the supplies needed for the rest of 2006 before the road closed. And arrangements had to be made to bring the remainder of the supplies in by air.