Grammar question: Clauses?

Okay. There is one adjective, one adverb, and one noun clause in this sentence : "I believe the buildings in Southwark, which was settled by the Swedes in the early 1600's, are even older than the buildings in the downtown area are." the 3 different clauses in that sentence are able to overlap (say, an adjective clause in a noun clause, or part of a noun clause in an adjective clause, etc) good luck.