Complex sentence: The Tsunami Society has issued a statement of caution regarding the Ward and Day research and research at Delft (Maarten Keulemans) disagreed with the geological model, favouring a different collapse.
Split into simpler sentences: The Tsunami Society has issued a statement of caution regarding the Ward and Day research. 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.