Complex sentence: Advisories had to be cleared through the Weather Bureau office in New Orleans, causing them to be hours late; moreover the advisories contained no forecast information, which would have allowed for preparation before the storm hit.
Split into simpler sentences: Advisories had to be cleared through the Weather Bureau office in New Orleans, causing them to be hours late. Worse still, the advisories contained no forecast information, which would have allowed for preparation before the storm hit.