Complex sentence: Over the next day as the cyclone approached, hurricane, storm and gale warnings were revised to cover various islands within the Koro and Southern Lau island groups, before all warnings were cancelled on November 28, as Sina moved away from Fiji.
Split into simpler sentences: Over the next day as the cyclone moved nearer to and passed through Fiji's waters, hurricane, storm and gale warnings were revised to cover various islands within the Koro and Southern Lau island groups. All gale, storm and hurricane force wind warnings were subsequently cancelled during November 28, as Sina passed through the Lau group of islands and moved away from Fiji.