Complex sentence: The operating certificate for the most lucrative part of their original operation, which was under FAR part 135 rules, was delayed and this fact, along with substantially lower passenger loads, led airline officials to cease operating and file for Chapter 11 bankruptcy in April 1984.
Split into simpler sentences: The operating certificate for the most lucrative part of their original operation, which was under FAR part 135 rules, was delayed. This fact, along with substantially lower passenger loads, led airline officials to cease operating and file for Chapter 11 bankruptcy in April 1984.