Complex sentence: Silas Jayne had contracted multiple hit teams, often simultaneously, in his many attempts to have George murdered and in 1965, men hired by Silas backed out an assassination plan, alerting George, who convinced them to report Silas to the police.
Split into simpler sentences: Silas Jayne had contracted multiple hit teams, often simultaneously, in his many attempts to have George murdered. In 1965, men hired by Silas backed out an assassination plan and alerted George, who convinced them to report Silas to the police.