Complex sentence: The Sendai International Music Competition is held every three years, at the Sendai City Youth Cultural Centre in Japan, with "the purpose of contributing to the development of world musical culture and the promotion of international cultural exchange through the discovery of young talented musicians".
Split into simpler sentences: The Sendai International Music Competition is held every three years at the Sendai City Youth Cultural Centre in Japan. It has the stated purpose of "contributing to the development of world musical culture and the promotion of international cultural exchange through the discovery of young talented musicians".