[lucagalbu]

Hi all! I'm a beginner in Japanese and in order to learn it I'm trying to translate Lord of the rings subtitles... however I have some problems, for example:
７つは偉大なる採掘士にして岩の館の細工師であるドワ ーフに与えられた。
I think the translation is: 7 (rings) is given to the dwarves who are the craftsmen of the halls of the mountains and even great miners.
Is this right? I have some doubts about the meaning of "にして" and "採掘士", moreover I can't figure out what なる stands for (in the beginning).

I guess that the language of the Lotr is too difficult for a beginner, but now I've already started translating it and so I'd like to finsh it!