Complex sentence: On the first Saturday of November, approximately 5,000 "chiliheads" convene in Terlingua for two annual chili cookoffs--the Chili Appreciation Society International championship and the Wick Fowler Cookoff.
Split into simpler sentences: On the first Saturday of November, approximately 5,000 chiliheads head down to Terlingua for its two annual chili cooksoffs. One, the Chili Appreciation Society International championship and the other the annual Wick Fowler Cookoff.