Complex sentence: Before impeachment could begin the next day, Mugabe resigned from office, with the ZANU-PF chief whip telling news organisations that Mnangagwa would take over as president within 48 hours.
Split into simpler sentences: Before impeachment could begin the next day, Mugabe resigned from office. The ZANU-PF chief whip duly nominated Mnangagwa, telling news organisations that he would take over as president within 48 hours.