Original: Kubrick 's next film , released in 1975 , was an adaptation of William Makepeace Thackeray 's The Luck of Barry Lyndon , also known as Barry Lyndon , a picaresque novel about the adventures and misadventures of an 18th-century Irish gambler and social climber .
Simplified: The film was based a book by William Makepeace Thackeray and was about an 18th century gambler named Barry Lyndon .