Complex sentence: Ellie also values Helton for the prosperity he brings to the farm, and is troubled by him just once, in a bizarre event in which she sees Helton silently shake her two boys in a terrifying manner after they had snatched his harmonica.
Split into simpler sentences: Ellie also values Helton for the prosperity he brings to the farm. She is troubled by him just once, in a bizarre event in which she sees Helton silently shake her two boys in a terrifying manner after they had snatched his harmonica.