Complex sentence: Albert confesses that he told Brumby that Doreen was Frank's daughter and Brumby said "good", this knowledge allowed Brumby to use the situation to his advantage against Kinnear.
Split into simpler sentences: Albert confesses that he then told Brumby that Doreen was Frank's daughter and Brumby said "good". This knowledge allowed Brumby to use the situation to his advantage against Kinnear.