Complex sentence: The Sampoong Group began construction of the Sampoong Department Store in 1987 over a tract of land previously used as a landfill, with the building's plans originally calling for a residential apartment with four floors, and the apartments to be built by Woosung Construction.
Split into simpler sentences: The Sampoong Group began construction of the Sampoong Department Store in 1987 over a tract of land previously used as a landfill. The building's plans originally called for a residential apartment with four floors, and the apartments were to be built by Woosung Construction.