Complex sentence: In 1990, the government built a modern shopping center, the Atrium superbloc which before 1997 Asian financial crisis hosted the international brand of Yaohan and Mark & Spencer as its anchor tenant.
Split into simpler sentences: In 1990, the government built modern shopping centre, the Atrium superbloc. Before 1997 Asia crisis, the international brand of Yaohan and Mark & Spencer were Atrium's anchor tenant.