Complex sentence: A fellow officer PC Andrea Dunbar worked along side Sergeant Smith to expose Gabriel for his crimes, for it was Andrea who Kerry confided in about her rape in Gabriel's hands the day before her death and informed Smithy.
Split into simpler sentences: A fellow officer PC Andrea Dunbar worked alongside Sergeant Smith to expose Gabriel for his crimes. Kerry had confided in Andrea about her rape at Gabriel's hands the day before her death and informed Smithy.