Complex sentence: Breen's widow, however, denied that her late husband had attended the meeting as he had spent that day with her, and Breen's diary recorded that on 16 March he was on leave.
Split into simpler sentences: Breen's widow, however, denied that her late husband had attended the meeting as he had spent that day with her. Indeed, Breen's diary recorded that on 16 March he was on leave.