Complex sentence: Its biggest claim to fame, apart from its star, is its failure at the box office, and this fact was exploited often for laughs in Benny's popular radio and television comedy series "The Jack Benny Program".
Split into simpler sentences: Its biggest claim to fame, apart from its star, is its failure at the box office. Benny often exploited its failure for laughs in his popular radio and television comedy series "The Jack Benny Program".