Complex sentence: An early season tropical storm, Mamie was the first storm to threaten the Philippines since Typhoon Lee, which devastated the nation the island previous winter, though days later Typhoon Nelson would strike the country, resulting in additional damage.
Split into simpler sentences: An early season tropical storm, Mamie was the first storm to threaten the Philippines since Typhoon Lee, which devastated the nation the island previous winter. However, a mere days later Typhoon Nelson would follow suit and strike the country, resulting in additional damage.