Complex sentence: The Wilkinson-coached Sooners did not lose more than one game in a season from 1948 to 1958, and his 1955 Oklahoma team is considered one of the greatest teams in college football history, regardless of era.
Split into simpler sentences: The Wilkinson-coached Sooners did not lose more than one game per season for 11 years, from 1948 to 1958. His 1955 Oklahoma team is considered one of the greatest teams in college football history, regardless of era.