英语语法问题?

dating back to the Eastern Han Dynasty, lanterns were at first used mainly for lighting. 哪位大神能分析一下这段话的句法结构

Dating back to Eastern Han Dynasty,
是现在分词短语作状语。
句子主干是
lanterns 主语
were (at first 状语 )used谓语
(mainly 状语 )for lightning. 主语补足语
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