Complex sentence: Barrett was the Prime Minister (who was assassinated) in "Burn the Butterflies" and a tough miner in "Golden Soak" and had secondary roles in many others, including "Something in the Air".
Split into simpler sentences: Barrett was the prime minister (who was assassinated) in "Burn the Butterflies" and a tough miner in "Golden Soak". He also had secondary roles in many others, including "Something in the Air".