Complex sentence: The devastating collapse of the banking boom had swept up du Cann's firm, Keyser Ullman, in its path, and du Cann did not put himself forward as a candidate in the leadership contest.
Split into simpler sentences: The devastating collapse of the banking boom had swept up du Cann's firm, Keyser Ullman, in its path. Du Cann did not put himself forward as a candidate in the leadership contest.