Complex sentence: After speaking with Grant, Olivia believes that Amanda Tanner (Liza Weil) was lying, however, when Olivia confronts the girl, it's revealed that Olivia herself had an affair with the President.
Split into simpler sentences: After speaking with Grant, Olivia believes that Amanda Tanner (Liza Weil) was lying. However, when Olivia confronts the girl, it's revealed that Olivia herself had an affair with the President.