Complex sentence: Several years of back pain, alcoholism, and prescription drug abuse severely damaged Williams' health; he divorced Sheppard and was dismissed by the Grand Ole Opry, which cited unreliability and frequent intoxication.
Split into simpler sentences: Several years of back pain, alcoholism, and prescription drug abuse severely damaged Williams' health. He divorced Sheppard and was dismissed by the Grand Ole Opry, which cited unreliability and frequent intoxication.