Complex sentence: Tessio and Connie's abusive husband, Carlo Rizzi, are also murdered for conspiring with Barzini; in a last demonstration of Vito's cunning, the Barzini-Tattaglia alliance had been allowed to whittle away the Corleone interests so they would appear weak.
Split into simpler sentences: Tessio and Connie's abusive husband, Carlo Rizzi, are also murdered for conspiring with Barzini. In a last demonstration of Vito's cunning, the Barzini-Tattaglia alliance had been allowed to whittle away the Corleone interests so they would appear weak.