你的句子中的 as 仍是介词，即as Isaac Newton and Winston Churchill只是一个介词短语，后面的谓语动词stuttered 的主语其实是 such famous people。句意：像艾萨克·牛顿和温斯顿·丘吉尔这样的名人也会口吃。

又如：

Such food as they gave us was scarcely fit to eat. 他们给我们的那些食物简直无法下咽。

Such poets as Keats and Shelley wrote Romantic poetry. 有些诗人，如济慈和雪莱，写的是浪漫主义的诗歌。

Such delicate negotiations as these call for great tact and patience. 像这样一些微妙的谈判需要有极大的机智刼耐心。

Such blemishes as there are in the work do not seriously take from its merits. 工作中的这些缺点，对其功绩并无多大影响。

注意体会下面的同义表达：

Such books as these are rare. =Books such as these are rare.= Books like these are rare. 这种书是罕见的。

Such men as these are dangerous.= Men such as these are dangerous.=Men like these are dangerous. 他们这种人很危险。

另外有时as可能是关系代词（引导定语从句）。如：

Such experience as I have is useless in this situation. 我的这些经验在这种情况下派不上用场。

Such changes as they made were minor and did not go far enough. 他们所做的这些改变都无关痛痒，不够深入。