Complex sentence: This is supported by research at Delft (Maarten Keulemans), both the Tsunami Society and Keulemans disagree with the geological model of Ward and Day, favouring a different collapse.
Split into simpler sentences: This is supported by research at Delft (Maarten Keulemans). The Keulemans work and the Tsunami Society paper, disagree with the geological model of Ward and Day, favouring a different collapse.