The Pali Text Society is a group of adults who have come together to learn and study the Pali language, which is an ancient language used in Buddhist texts. They work very hard to find, translate, and publish these texts so that people all over the world can read and understand them.
Think of it like a big puzzle: the Pali Text Society helps to put together all the pieces of the puzzle so we can see the whole picture of what the Buddha taught in his teachings. And just like how it can take a long time to solve a difficult puzzle, it can take the members of the society a long time to translate and understand these ancient texts. But they don't give up, because they want to share this important knowledge with as many people as possible.