求助NN~~~~~OG12-68

The first trenches .....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.

我看不出simultaneously with 和independently中间那个but 是转折什么呢。。。。话说这意思很混乱。。。求助NN帮忙翻议下~~谢~~

这题我研究了好久还是看不明白，同求

同意2楼的.

为让句子简洁,省略了[the more celebrated city-states of southern Mesopotamia, in what is now southern Iraq.].把省略部分放回原句就清楚了.

The first trenches .....have yielded strong evidence that centrally administered complex societies in northern regions of the Middle East arose simultaneously with [the more celebrated city-states of southern Mesopotamia, in what is now southern Iraq.]but independently of the more celebrated city-states of southern Mesopotamia, in what is now southern Iraq.