Complex sentence: Her ancestors can be traced back to an ancient Lenz family member of the Swiss Bourgeoisie of Lenzburg, which moved to Hungary and lived for several centuries in Pressburg.
Split into simpler sentences: Her ancestors can be traced back to the ancient Lenz family, which was member of the Swiss Bourgeoisie of Lenzburg. A branch of that family moved to Hungary and lived for several centuries in Pressburg.