Complex sentence: About 12 hours after being designated a cyclone, the storm strengthened to the equivalent of a tropical storm with winds reaching 65 km/h (40 mph) while located 555 km (345 mi) south-southeast of Chittagong, Bangladesh.
Split into simpler sentences: About 12 hours after being designated a cyclone, it strengthened to the equivalent of a tropical storm, with winds reaching 65 km/h (40 mph). At that time, it was located 555 km (345 mi) south-southeast of Chittagong, Bangladesh.