Complex sentence: Thomas County Central High School and Cairo High School are their primary rivals, while there was a suspension of the two series' in the late 1990s, they now play Cairo High School in the early part of the season each year.
Split into simpler sentences: Thomas County Central High School and Cairo High School are their primary rivals. While there was a suspension of the two series in the late 1990s, they now play Cairo High School in the early part of the season each year.