句子结构考验

Of all the art-related reference and research libraries in North America, that of the Metropolitan Museum of a Art in New York City is among the largest and most complete.

请教大牛来分析一下句子结构。多谢

不是大牛,说说我的看法

Of all the art-related reference and research libraries in North America, that of the Metropolitan Museum of a Art in New York City is among the largest and most complete.(art-related reference and research libraries in North America)

that指代前面the art-related reference and research libraries视为同一类东西,所以用that不用those

of all = among

有错请指正