Complex sentence: Part of the Seattle Art Museum, SAAM occupies the 1933 Art Deco building which was originally home to the Seattle Art Museum and its maincollection which moved to a newly-constucted building indowntown Seattle in 1991, at which time the Seattle Asian Art Museum was created.
Split into simpler sentences: Part of the Seattle Art Museum, SAAM occupies the 1933 Art Deco building which was originally home to the Seattle Art Museum and ist main collection. In 1991 the Seattle Art Museum moved to a newly-constucted building in downtown Seattle, at which time the Seattle Asian Art Museum was created.