Complex sentence: On that day General Pulikovsky issued an ultimatum to the rebels to leave Grozny within 48 hours-in the event of non-compliance, attacks would be launched from all directions and with all available means.
Split into simpler sentences: On that day General Pulikovsky issued an ultimatum to the rebels to leave Grozny within 48 hours. In the event of non-compliance, attacks would be launched from all directions and with all available means.