I sat down on one of those modern chairs with holes in it an
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I (主语) sat down (谓语) on one of those modern chairs with holes in it (介词短语作状语), 其中 with holes in it 系介词短语作定语修饰 chairs. 之所以用 it, 因为它所代的名词是单数: one of those modern chairs. ...and waited (并立句: and=连词; waited=胃语)

整个句子的意思是: 我在一个有洞眼的现代式椅子坐了下来并等着/我坐在一个现代式, 有洞眼的那种椅子上等着..