Complex sentence: Until 1958 he taught associated courses in the use of computers, and in 1958 he established a Postgraduate Diploma in Numerical Analysis and Computing which was later changed to the Postgraduate Diploma in Computer Science.
Split into simpler sentences: Until 1958 he taught associated courses in the use of computers. In 1958 he established a Postgraduate Diploma in Numerical Analysis and Computing which was later changed to the Postgraduate Diploma in Computer Science.