Complex sentence: The main manufacturing business which had started in the workshop at Irishman Creek in 1939 moved to Christchurch in 1948 from here supplied with heavy machinery-in particular to the Waitaki River hydroelectric projects.
Split into simpler sentences: The main manufacturing business, which had started in the workshop at Irishman Creek in 1939, moved to Christchurch in 1948. From there the company supplied heavy machinery, in particular to the Waitaki River hydroelectric projects.