下面的句子请帮忙分析结构,
Thedoorwaysandwindowsaremadepossiblebyplacingovertheopenspacesthickstonebeamsthatsupporttheweightfromabove.这句话是被动语态,句子的后半部分placingoveropenspacesthickstonebeamsthat...该怎么理解其结构?是不是可以写成placingthickstonebeamsoveropenspaces?