Original sentence: America's National Game is a book by Albert Spalding, published in 1911, that details the early history of the sport of baseball.Much of the story is told first-hand since, since the 1850s, Spalding had been involved in the game, first as a player and later as an administrator.Spalding was, however, said to aggrandise his role in the major moments in baseball's history
Edited sentence: America's National Game is a book by Albert Spalding, published in 1911 detailing the early history of the sport of baseball.Much of the story is told first-hand, since Spalding had been involved in the game, first as a player and later an administrator, since the 1850s.Spalding was, however, known to aggrandise his role in the major moments in baseball's history