Like what happens in the last chapter I was so confused?

After the dramatic events of Parts One and Two, Part Three tells us what happens next. Camp Green Lake is closed down and the Warden sells off the land, Stanley's father's invention is successful, and Zero hires a team of private investigators and finds his mother. The Yelnats family splits the treasure with Zero, and buys a new house with their half.

A year and a half later, we see Stanley at a party at his house: the family is celebrating a Super Bowl ad for Stanley's father's product. Clyde Livingston is at the party, and he stars in the ad. Zero and his mother are also there.