Complex sentence: The center was opened in the 1972 by HM Queen Elizabeth II, originally called the'Shopping City' until it was changed by the local council to promote the name of Halton in the early 1990s.
Split into simpler sentences: The center was opened in the 1972 by HM Queen Elizabeth II, and was originally called the'Shopping City'. This was until it's name was changed by the local council to promote the name of Halton in the early 1990s.