Complex sentence: The Lehigh-Lafayette rivalry, inaugurated in 1884, has been contested 152 times on a gridiron.THE GAME is, however, central to the Harvard-Yale athletic rivalry.
Split into simpler sentences: The Lehigh-Lafayette rivalry, inaugurated in 1884, has meet 152 times on a gridiron. However THE GAME, the football rivalry, is central to the Harvard-Yale athletic rivalry.