Hello !

I just found out that I have no idea how to say the above sentence in Turkish !

This doubly-that pattern is totally new to me. 

Also, this sentence "The thing that I know that I will do"

I asked my turkish friend, he said that it would translate to "Bildigim sey, yapacam sey" but I´m not convinced. 

However, I am not a Turkish native speaker and I am still learning the language but as far as I know is that "Bildigim sey, yapacam sey"is "I will do whatever I know".

Maybe it might be " bildiğim kitabı okuyacak çönkü bunu zor olmayacak."

I will read the book I know because it won´t be difficult.

I would like to read any more sggestions from the other Turkish mates

I will read the book that I know it won´t be difficult.

Zor olmayacağını bildiğim kitabı okuyacağım.

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 Yapacağımı bildiğim şey....

 The thing that I know that I will do......

Kolaymış ! aklıma nasıl gelmedi bilmiyorum !

Çok teşekkürler Shayma ve Tunci.