Complex sentence: McGrigor also commanded Exercise Verity, a major multi-lateral naval exercise for the Western Union Defense Organization (WUDO), in 1949 and went on to be Commander-in-Chief, Plymouth in March 1950.
Split into simpler sentences: McGrigor also commanded Exercise Verity, a major multi-lateral naval exercise for the Western Union Defense Organization (WUDO), in 1949. He went on to be Commander-in-Chief, Plymouth in March 1950.