Complex sentence: After Alex apologizes for lying about the DEO, Eliza says there's something she needs to tell both of the girls, only to be interrupted by a phone call for Alex, who leaves for work.
Split into simpler sentences: After Alex apologizes for lying about the DEO, Eliza says there's something she needs to tell both of the girls. The conversation is interrupted when Alex is called into work., only to be interrupted by a phone call for Alex and she leaves for work.