Your speaking allows native speakers to judge what levels you are at and then adjust their speaking downward to you, providing you (with省略）input that is more easily understood.

参考译文：你的口语使说母语人判断你目前的你讲的语言所处在一个什么水平，然后调整他们对你说话的水平，这样就可以为你提供更加容易理解的信息输入。 

句中四个语言知识点如下：

(1)your speaking 为动名词复合结构作主语，your为动名词逻辑主语。

(2)that is more easily understood为定语从句修饰名词“input 输入的信息”关系代词代替先行词“input”。

(3)providing you with input that is more easily为现在分词短语作结果状语。

(4)provide sb with sth 向某人供给/提供/给予某物

The government was not in a position to provide them with food.

政府不可能给他们提供食物。