The problems confronting the new government were enormous大家帮

主体是The problems were enormous.
confronting the new government 是problems 的定语.正常语序：The problems confront the new government.意思是这些难题是新政府面临困境.
confront:vt.
1.面对；对抗；与（某人）对峙
2.迎面遇到,遭遇
3.使对质,使当面对证
4.处理,解决（问题或困境）
5.使面对,使面临,使对付（令人不快或难处的人、场合）
6.面对（某事物）
7.(问题或困境 )使…无法回避；降临于

The problems是主语，confronting the new government是定语，修饰the problems。省略了that/what，were是系动词，enormous是表语，总的来说这句话的结构是主系表结构

The problems 是主语
confronting the new government 是主语的定语
were 系动词
enormous 表语
是新的政府无法回避的问题是巨大的