TOEFL integrated practice 8 - please revise my writing, thanks :)

The meaning of history, according to the reading, is a selection of events based on the interpretation of the historian recording the event. Selection and interpretation are the major factors when identifying the concept of history. In the lecture, the professor tells about a story of a man who were was a candidate for a presidential election. The two Two books were published based on his life story and the contents that those two books were dealing with were {an argument can be made to use "are" instead of "were" in this sentence, since the books still deal with the topic, in a sense, but since the proceding part of the passage continues in the past tense, you are correct in using were, although I would try to rephrase it because the double "were" sounds a little strange.} totally different from each other. The first book mainly focused on the negative parts of his life such as the financial problems of his father, his failure to organize a football team in high school, as well as his mediocre grades. Meanwhile, the second book portrayed the bright parts of his life, including a happy home life with lovely parents in his early years, his experience serving as a student president in high school, his great academic interest in university, and an outstanding performance in military. Therefore, as we can see, the story of his life becomes entirely different based on the two key factors that the reading passage discusses: what events do the historians (writers) decide to select and how they interpret the story in a certain direction