Okay kiddo, so a long time ago in Thailand, people had trouble reading and writing because there were a lot of different ways to spell the same words. This was because people used different letters for the same sounds and sometimes they didn't even spell things the way they sounded.
So the Thai government decided to make things easier for everyone by changing the way they spell words. They wanted to make sure that everyone spelled things the same way and that it was easier to learn how to read and write.
In 1942, they made some changes to the alphabet and got rid of some old letters that weren't really used anymore. They also simplified some of the spelling rules and made some new ones. This made it easier for everyone to learn how to read and write.
Nowadays, people in Thailand still use the same spelling that was changed back in 1942. It's much easier to read and write and everyone can understand each other better. And that's how the Thai spelling reform of 1942 helped make things simpler and easier for everyone!