Complex sentence: Mining was suspended for a short period in 1987, and of further note is a mine fire in 2005 that lasted uninterrupted for an excess of 5 weeks, causing 700 million Norwegian kronas worth of damage.
Split into simpler sentences: Mining was suspended for a short period in 1987. In 2005, a mine fire erupted, lasting uninterrupted for more than five weeks, and causing 700 million Norwegian kronas worth of damage.