At the same time machine tool and die makers
who provided all the precision parts and mechanincal devices
for the factory infrastructre
flourished as technology continued to improve,
the offshoots of which reared a range of new and exciting careers, particularly of interest to the large groups of young men
returning from military duty around this time,
and kept unemployent rates down while boosting overall spending.
해석은 자연스럽게 대강 할수 있는데요..
볼드체로 표시한 저부분을 정확히 이해할수가 없네요..
근데..
1)the offshoots 이 그 앞에 있는 문장을 가리키는것 맞죠? 왠지그런것같은데
문법기초가 없어서 100%확신을 못하겠네요
2)굳이 of which가 온 이유를 몰겠네요....왜 of가 들어간거죠?
고수님들!
답변부탁이용^^ㅜㅜㅜㅜ