PDF is easy to read on iPhone. How to collect the same?

Question

PDF

I downloaded the book in pdf format, since there were no other formats. I don’t like to read PDF on iPhone, because I have to scroll a lot and adjust the scale with my fingers.
But this book, apparently, has already been processed by someone before me and filled it like this. Reading is convenient. The text is placed on one screen without any zoom at all.
I am attaching 2 images: adapted for the phone and in the form of a regular book.
Interested in what means can be used to rebuild the first version of the usual pdf?
Thank you.