Complex sentence: His three final home runs did indeed come at Forbes Field in one afternoon, however unlike in the film, he did not retire following (or during) the game, but rather played five more games that year before injuring his knee and hanging it up.
Split into simpler sentences: His three final home runs did indeed come at Forbes Field in one afternoon; however, he did not retire following (or during) the game as seen in the film. Ruth appeared in five more games that year before injuring his knee and hanging it up.