Complex sentence: The investigators later said that Todashev implicated both himself and Tamerlan Tsarnaev in the murders during the questioning and that Todashev was beginning to write a formal statement when he asked to take a break and then suddenly attacked the FBI agent.
Split into simpler sentences: The investigators later said that Todashev implicated both himself and Tamerlan Tsarnaev in the murders during the questioning. They said that Todashev was beginning to write a formal statement when he asked to take a break, and then suddenly attacked the FBI agent.