1 In this sentence, the verb "subjected" and the phrase "subjected me to" means "made me listen to/forced me to listen to" 1 He (subjected me to) FORCED ME TO LISTEN TO a monologue on his last stay in hospital. 2 "a monologue" is "a long speech by one person OR one person who talks and talks and is the only one talking in a discussion or conversation" 2 He (subjected me to) FORCED ME TO LISTEN TO a (monologue) HIM DOING ALL THE TALKING on his last stay in hospital. 3 "on his last stay in hospital" means THE LAST TIME HE WAS IN THE HOSPITAL AS A PATIENT He FORCED ME TO LISTEN TO HIM DOING ALL THE TALKING ABOUT THE LAST TIME HE WAS IN THE HOSPITAL AS A PATIENT. = He subjected me to a monologue on his last stay in hospital.