Complex sentence: Pointe-à-Callière was first built, back in the early 1990s, the Museum had plans to open up the William collector sewer and the remains of St. Anne's Market and the Parliament of the United Province of Canada.
Split into simpler sentences: Pointe-à-Callière was first built, back in the early 1990s. The Museum had plans to open up the William collector sewer and the remains of St. Anne's Market and the Parliament of the United Province of Canada.