ChatGPT said:
Here is an improved, smoother, more polished version of your writing while keeping the same meaning and tone:
After Mango finished exploring his new home, he decided to peek outside. When he opened the window, he was greeted by the sight of a large glowing mango hanging in the sky where a moon should have been.
The mango moon cast a warm light over the town Mango now lived in. He gazed outside, taking in the unfamiliar world he had been transferred to—along with the strange new body he now inhabited.
Wanting answers about what had happened before he arrived, Mango decided to investigate further.
He began with the diary. Lighting a lantern using the box of matches lying around—something Mango was surprised they even had—he opened the worn pages and started to read. The first date that caught his eye was 6/7/1167.
Mr. Blud had found a notebook belonging to the Gooner family.
The next entry was dated 7/7/1167.
Mr. Blud invited me to help translate it. Together, we were able to interpret the first page, which explained why the Aurabluds had been outlawed in Mangoville, the very place where Mango now lived.
If you'd like it more dramatic, whimsical, darker, or styled for a novel, I can revise it further!