Complex sentence: On November 14, the Joint Typhoon Warning Center (JTWC) issued a tropical cyclone formation alert, and at 1800 UTC that day, the agency initiated advisories on Tropical Depression 31W to the east of the Marshall Islands.
Split into simpler sentences: On November 14, the Joint Typhoon Warning Center (JTWC) issued a tropical cyclone formation alert. At 1800 UTC that day, the agency initiated advisories on Tropical Depression 31W to the east of the Marshall Islands.