well the first problem is you are stating facts about it but also saying you cant understand it. I actually enjoyed reading the facts whre the "book" just had me pulling up pages after pages of facts proving the claims wrong. the main thing I took from the intro is he believes the absence of evidence is the evidence of absence when it doesn't work that way.
Also he explains how he calculated the trajectory and that he only had one flightpath to go off of but all the other Apollo missions followed the same flight path out of the low orbit of earth.

The reason for all the math gargon its so people can redo the math if they aren't sure his calculations were correct like he shows the link to the first person that claims they did the math messed up. Basically that link is to a correction of another person claiming they did the math showing results that were false. he is proving them wrong with mathematical evidence where the other person just made a bunch of claims spouted out a bunch of numbers and when people asked to see the math behind it he had to admit it was a lie.

Basically it proves mathematically that the amount of radiation you get hit with is not enough to be a problem in such short durations. If it was a problem people couldnt spend 100+ days on the space station and stuff.

skip the math, he basically explains everything in the paragraphs before and after he shows you the calculations. unless your wanting to double check his work.
:D

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=16&ved=0ahUKEwj9-tTOlODWAhUC7mMKHT6_CRAQFgh0MA8&url=https%3A%2F%2Fwww.hq.nasa.gov%2Falsj%2Fa11%2Fa11fltpln_final_reformat.pdf&usg=AOvVaw2alRLBd3_ZMJ0WV4lIAa2i

that link is to the original photocopies of the Apollo 11 flight plan in pdf form. the information has not been lost.