Complex sentence: Adjusted for inflation and wealth and population increases, Andrew ranks as the second costliest hurricane in history (behind the Great Miami Hurricane), though it is likely to be surpassed by Hurricane Katrina of the 2005 season once damages from that storm are totaled.
Split into simpler sentences: Adjusted for inflation and wealth and population increases, Andrew ranks as the second costliest hurricane in history (behind the Great Miami Hurricane). However, it is likely to be surpassed by Hurricane Katrina of the 2005 season once damages from that storm are totaled.