Complex sentence: Miles Craven, dying of old age, finally killed himself in order to be resurrected as a cloned body of Sigma; while uploading his memories into the clone a member of Team 7 killed him.
Split into simpler sentences: Miles Craven, dying of old age, finally killed himself in order to be resurrected as a cloned body of Sigma. While uploading his memories into the clone, a member of Team 7 killed him.