Complex sentence: O'Neill finds no evidence of Hanssen leading a secret double life and develops a growing respect for his boss, so he confronts his handler in the undercover assignment, Kate Burroughs, and she admits that the sexual deviance allegations are only a secondary consideration.
Split into simpler sentences: O'Neill finds no evidence of Hanssen leading a secret double life and develops a growing respect for his boss. O'Neill confronts his handler in the undercover assignment, Kate Burroughs, and she admits the sexual deviance allegations are only a secondary consideration.