Complex sentence: Neville Chamberlain wrote of Simon: "I am always trying to like him, and believing I shall succeed when something crops up to put me off", while Harold Nicolson described him more pithily as "a toad and a worm".
Split into simpler sentences: Neville Chamberlain wrote of Simon: "I am always trying to like him, and believing I shall succeed when something crops up to put me off". While Harold Nicolson described him more pithily as "a toad and a worm".