这句话中的for what was to be 在句中 是什么语法知识?

题目

这句话中的for what was to be 在句中 是什么语法知识?
fallois proposed that proust had tried to begin a novel in 1908,abandoned it for what was to be a long demonstration of saint-beuve's blindness to the real nature of great writing ,found the essay giving rise to personal memories and fictional developments ,and allowed these to take over in a steadily developing novel .

答案

for what was to be a long demonstration of Saint-Beuve's blindness to the real nature of great writing.这句话应该是这样的:Proust放弃了写小说,〖因为这件事情是圣伯夫对伟大文学写作视而不见的一个长期展现...