Complex sentence: Michael, who distanced himself from the family's criminal activity, volunteers to kill Sollozzo and McCluskey, arguing that McCluskey is fair game because he is a corrupt cop mixed up in the drug trade.
Split into simpler sentences: Michael, who distanced himself from the family's criminal activity, volunteers to kill Sollozzo and McCluskey. Michael argues that McCluskey is fair game because he is a corrupt cop mixed up in the drug trade.