I have a paper to write before class.
I can say this, if I'm not mistaken, this way:
I have a paper which is to be written before class.
What has happened here? What is the name of this?
The inherent desire to develop that technique caused him to spend 11 years on it.
Here this can be said in this way:
The inherent desire (which was to/in order to) develop that technique caused him to spend 11 years on it.
Could you give me a link for further study?