Complex sentence: In 1953 he joined Reuters as a foreign correspondent for whom he reported for the Suez Crisis in 1956, the Hungarian Revolution of 1956, and the Congo Crisis 1960-1963.
Split into simpler sentences: In 1953 he joined Reuters as a foreign correspondent. Among the events he reported for Reuters were the Suez Crisis in 1956, the Hungarian Revolution of 1956, and the Congo Crisis 1960-1963.