Complex sentence: He illustrated the C. Day Lewis children's novel, "The Otterbury Incident" (1948), and one of his happiest collaborations was that with Eleanor Farjeon, especially on "The Little Bookroom" (Oxford, 1955 collection).
Split into simpler sentences: He illustrated the C. Day Lewis children's novel, "The Otterbury Incident" (1948). One of his happiest collaborations was that with Eleanor Farjeon, especially on "The Little Bookroom" (Oxford, 1955 collection).