给定一篇英文文章，修改其中的语法和单词选用以达到更高的可读性和流畅性。
"The writer of the book did his research and found that there was many things that he did not know before. He was surprised to find out that some of his assumptions were wrong, and that he needed to make revisions to his manuscript. The book was better for it in the end."
"The author of the book conducted research and discovered many things of which he was previously unaware. He was astonished to discover that some of his assumptions were incorrect and that he needed to revise his manuscript. Ultimately, the revisions resulted in an improved book."