Complex sentence: Hadid's Pavilion is a tensioned fabric shell fitted over a curving aluminum framework exceeding 7,000 pieces, was expected to accommodate centennial-themed, video presentation its interior fabric walls, but is not expected to open until at least mid-July 2009.
Split into simpler sentences: Hadid's Pavilion is a tensioned fabric shell fitted over a curving aluminum framework exceeding 7,000 pieces. It is not expected to open until at least mid-July 2009.