Complex sentence: The island was previously known as Kitchener's Island, named after Lord Kitchener who was granted the island as a reward for his services in the Sudan Campaign (1896--1898).
Split into simpler sentences: The island was previously known as Kitchener's Island, named after Lord Kitchener who owned it. He was gifted the island as a reward for his services in the Sudan Campaign (1896--1898).