OG-68

OG第68题：The first trenches cut into a 500-acre site at Tell Hamozkar,Syria,have yielded strong evidence that centrally administered comples socities in northern regions of  the Middle East arose stimoultaneously with but independently of the more celebrated city-states of southern Mesopotamia,in what is now southern Iraq.

这是将正确选项E带入后的句子，我无法理解句子的意思，有人能帮帮我吗?看不懂啊

想问下cut into a 500-acre site at Tell Hamozkar在句子里做什么成份？