Complex sentence: Tatum won an Oscar for her performance in a very popular movie and in 1973, Ryan O'Neal was voted by exhibitors as the second most popular star in the country, behind Clint Eastwood.
Split into simpler sentences: Tatum won an Oscar for her performance in a very popular movie. In 1973, O'Neal voted by exhibitors as the second most popular star in the country, behind Clint Eastwood.