The actual figure was made of copper supported by a metal fr

The actual figure was made of copper supported by a metal framework 。。。这句结构是……
这是新概念二93课的一句：
The actual figure was made of copper supported by a metal framework which had been especially constructed by Eiffel.
为了好问，先把我没有疑问的从句简化掉：
The actual figure was made of copper supported by a metal framework
在我的理解中The actual figure是主语，was made of是谓语，copper是宾语，
但是supported这个动词又算什么？而且看起来"supported by a metal framework"似乎也是个被动语态，但前面又少了一个be。。。
脑子有点混乱，求高人点拨，感激涕零！