Complex sentence: Elen's performance could so easily have been a caricature, but he performed the songs and patter in a realistic manner, one that endeared him to his audiences, nostalgic for a way of life that was disappearing.
Split into simpler sentences: Elen's performance could so easily have been a caricature, but he performed the songs and patter in a realistic manner. One that endeared him to his audiences, nostalgic for a way of life that was disappearing.