Here's a breakdown:
* "The horse that no one expected to win..." This sets the scene for an underdog story. The horse was likely considered a long shot, not a favorite to win.
* "...inched his way the lead..." This means the horse was slowly but surely gaining ground on the other horses in the race, moving into first place.
* "...jockey leaning forward in saddle..." This is a common position for jockeys when they are urging their horses to run faster. It shows the jockey's determination to win.
* "Run Ace run!" This is likely the jockey's encouragement to the horse, calling out its name. "Ace" is probably the horse's name.
* "...crossed finish line and?" The sentence is left unfinished, creating suspense. We don't know if the horse actually won or not!
The passage is a cliffhanger, leaving us wondering whether the underdog horse was able to pull off an unexpected victory.