the mansions in which the flat was situted was a comparatively small one.两个was,该如何让分析句子

the mansions in which the flat was situted was a comparatively small one.两个was,该如何让分析句子

mansion[英][ˈmænʃən] [美][ˈmænʃən] n.大厦；宅第,公馆
这个句子中的in which the flat was situated 是一个定语从句,先行词为mansions
The mansion was a comparatively small one.是主句.
这个句子的意思是:这个公寓位于的大厦是一个相对而言较小的一个.