Complex sentence: Scrooge goes home to Scotland, but after realizing that he doesn't fit in very well there anymore, he hires Scottie McTerrier to look after the McDuck castle for him, while he and his sisters leaves for America and Duckburg.
Split into simpler sentences: Scrooge goes home to Scotland, but soon realises that he don't fit very well there anymore. So in the Scrooge he hires Scottie McTerrier to look after the McDuck castle for him, while he and his sisters leaves for America and Duckburg.