Complex sentence: "Lotte Hotel Jeju" was opened in 2000 at the Jeju Island, which temperate climate, natural scenery, and beaches make it a popular tourist destination for South Koreans as well as visitors from other parts of East Asia.
Split into simpler sentences: Lotte Hotel Jeju was opened in 2000 on Jeju Island, which has a temperate climate, natural scenery, and beaches. Jeju is a popular tourist destination for South Koreans as well as visitors from other parts of East Asia.