Please help me understand this sentence.

The struggle between the representatives of an urban bourgeoisie, which was also landowning, and long-established rural feudal magnates bears strongly upon our understanding of renaissance humanism which* provided the intellectual programme of *which the landscape idea is one expression.

I couldn't figure out what the two "which"s refer to. Do they suppose to refer to a same word? Or they can refer to different words.
I feel the first "which" refers to "renaissance humanism", and the second, "of which" refers to "intellectual programme". I don't know if my understanding is right, please give me some advice.

Thanks a lot!