1. despite the scarcity of my funds只是一个让步状语,并不是句子的主语.
注：despite是介词,不是连词,所以引导让步状语,而不是让步状语从句.
was that I refused to be driven around town是主句的系表结构,表语从句做表语.句子的主语还是My primary motivation.
behind buying a car是介宾短语做主语My primary motivation的后置定语.
2. refused to be driven只是一个不定式的被动结构而已.
1）不定式的主动结构：refuse to do sth“拒绝做某事”
如：I refused to help him.
我拒绝帮助他.
2）不定式的被动结构：refuse to be done“拒绝被...”
如：I refused to be helped by him.
我拒绝被他帮助/我拒绝他帮助我.