Complex sentence: Sonny informs Vito that Fredo is being sent to Las Vegas to learn the casino business and when asked Tom informs him that it was Michael who killed Sollozzo and McCluskey and thus had to flee.
Split into simpler sentences: Sonny informs Vito that Fredo is being sent to Las Vegas to learn the casino business. When asked, Tom informs Vito that it was Michael who killed Sollozzo and McCluskey and thus had to flee.