Complex sentence: Taejong, who had just abdicated, but was still a military adviser to his successor, King Sejong, favored a retaliatory offensive response, and Yi Ye subsequently advised the royal Joseon Navy in logistics during the invasion of Tsushima in 1419.
Split into simpler sentences: Taejong, who had just abdicated, but was still a military adviser to his successor, King Sejong, favored a retaliatory offensive response. Yi subsequently advised the royal Joseon Navy in logistics during the invasion of Tsushima in 1419.