My Answer B (Awaiting OA)
The Anasazi settlements at Chaco Canyon were built on a spectacular scalewith more than 75 carefully engineered structures, of up to 600 rooms each, were connected by a complex regional system of roads.
A. with more than 75 carefully engineered structures, of up to 600 rooms each, were -"were" is not required. we just need to say that "Canyon had more than 75 structures connected by system of roads." B. with more than 75 carefully engineered structures,
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The Anasazi settlements at Chaco Canyon were built on a spectacular scalewith more than 75 carefully engineered structures, of up to 600 rooms each, were connected by a complex regional system of roads.
A. with more than 75 carefully engineered structures, of up to 600 rooms each, were -"were" is not required. we just need to say that "Canyon had more than 75 structures connected by system of roads." B. with more than 75 carefully engineered structures,
...
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