You start learning The english that xx tells it to me.

错!
这句话翻译成中文是:xx告诉我你开始学英语了.开始学英语与xx告诉我这件事都已是过去时，故都得用过去式．但你开始学英语是在别人告诉我之前，是过去的过去，应用过去完成式表事情在过去的过去发生．所以此句可译成：
1．You had started English that I heared it from xx.
2.I was told that You had started English from xx.
3.xx told me that You had started English .
4.I heared that You had started English .
注意：2 3 4比较好，1较生硬．

I learnt (heard) from XX that you have started learning English.

或：
I was told by XX that...
XX told me that you....

最后一个会比较英语化一些。

You start learning The english that xx tells to me.

语法不正确,要去掉IT

You start learning The english that i heard from xx
也是一样的问题

我感觉这样表达更好：
I heard from xx that you have started learning english(。前面不用加the啊）

You start learning The english that i heard from xx
应该这样

last one is better.