Complex sentence: Expensive to operate compared to new airliners, the number in use was reduced after the 2008 recession and it does not comply with current international noise restrictions, although government transport and emergency response examples are exempt from this ruling.
Split into simpler sentences: Expensive to operate compared to new airliners, the number in use was reduced after the 2008 recession. It does not comply with current international noise restrictions although government transport and emergency response examples are exempt from this ruling.