The first trenches cut into a 500-acre site at Tell Hamoukar,Syria,have yielded strong evidence that centrally administered complex societies in northern regions of the Middle East arose simultaneously with but independently of the more celebrated city-states of southern Mesopotamia, in what is now southern Iraq.
His studies of ice-polished rocks in his Alpine homeland,far outside the range of present-day glaciers,led Louis Agassiz in 1837 to propose the concept of an age in which great ice sheets existed in what are now temperate areas .
这句话里面 in what 是引导状语从句的吧?= great ice sheets existed where are now temperate areas