Complex sentence: Lemass himself encouraged his Minister for Finance, Jack Lynch, to contest the party leadership, and encouraged Colley, Haughey and Blaney to withdraw in favour of Lynch, arguing that they would not win a contest against him.
Split into simpler sentences: Lemass himself encouraged his Minister for Finance, Jack Lynch, to contest the party leadership. Lemass also encouraged Colley, Haughey and Blaney to withdraw in favour of Lynch, proposing that they would not win a contest against him.