Complex sentence: Karai asks him to tell her more about the truth about her mother and him, but Shredder claims she already knows the "truth", but his words are interrupted when Tiger Claw returns and Shredder sends him and Karai to go after the Turtles again.
Split into simpler sentences: Karai asks him to tell her more about the truth about her mother and him, but Shredder claims she already knows the "truth". When Tiger Claw returns, Shredder sends him and Karai to go after the Turtles again.