在这个句子中，定语从句that is added to a database that might interest
me修饰everything，其中定语从句that might interest me说明a
database。再加上主句是一个否定句，因而整个句子就显得复杂了。如果如下改写一下，相信就容易理解了：I would not rely on agents
for finding everything that is added to a database,but I would only try to find
things that might interest me.
这个是网上的一个解释，不过不怎么懂