Complex sentence: Warm, dry weather help spread the fires, which quickly spread into the region's forests; daytime temperatures had reached 25 ° C and a spreading wave of flames soared to 3 meters in height.
Split into simpler sentences: Warm, dry weather help spread the fires, which quickly spread into the region's forests. Daytime temperatures had reached 25 ° C and a spreading wave of flames soared to 3 meters in height.