Complex sentence: The earliest interuniversity football league was the Canadian Intercollegiate Rugby Football Union (CIRFU) formed in late 1897 and commencing competition in 1898 and competing for the Yates Cup, donated by H. B. Yates of McGill University in 1898 and awarded to the league champion annually.
Split into simpler sentences: The earliest interuniversity football league was the Canadian Intercollegiate Rugby Football Union (CIRFU) which was formed in late 1897 and began competition in 1898. The CIRFU competed for the Yates Cup, donated by H. B. Yates of McGill University in 1898 and awarded to the league champion annually.