Complex sentence: In 1964, "Wide World of Sports" covered the Oklahoma Rattlesnake Hunt championships; the following year, ABC premiered outdoor program "The American Sportsman", which remained on the network for nearly 20 years.
Split into simpler sentences: In 1964, "Wide World of Sports" covered the Oklahoma Rattlesnake Hunt championships. The following year, "The American Sportsman" premiered, and it would stay on for nearly 20 years.