Complex sentence: Following World War II there has been like in many other cities a decline in secondary industries that thrived in the 19th Century but this decline was reversed in the growth of new tertiary industries such as retail, call centres, offices and media.
Split into simpler sentences: Following World War II there has been, as in many other cities, a decline in secondary industries that thrived in the 19th Century. However this decline was reversed in the growth of new tertiary industries such as retail, call centres, offices and media.