Complex sentence: Kate Moore in "The Enforcer" is killed by terrorists while saving Callahan's life, after citing to him the names of previous dead officers (Fanducci and Smith) to demonstrate that she is aware of the risks of being his partner.
Split into simpler sentences: Kate Moore in "The Enforcer" is killed by terrorists while saving Callahan's life. She had previously cited to Harry the names of previous dead officers (Fanducci and Smith) to demonstrate that she is aware of the risks of being his partner.