Complex sentence: William Craigie (1867-1957) was a philologist and a lexicographer, the third editor the Oxford English Dictionary and co-editor (with C. T. Onions) of the 1933 Supplement.
Split into simpler sentences: William Craigie (1867-1957) was a philologist and a lexicographer. He was the third editor of the Oxford English Dictionary and co-editor (with C. T. Onions) of the 1933 supplement.