Well kiddo, have you ever heard of evolution? It's when things change over a really long time. And there's this thing called schizophrenia, which is a type of illness that can affect people's brains and make it harder for them to think and communicate.
Scientists think that schizophrenia might have evolved over time because it's a complex illness that involves lots of different genes and brain processes. It's possible that some of these genes and processes were helpful for our ancestors, but then they started to cause problems as our brains got more complex.
For example, some scientists think that people with schizophrenia might have a harder time filtering out irrelevant information from their surroundings. This could be a problem if you're living in a noisy or crowded environment, but it could have been helpful if you were trying to detect potential dangers like predators or enemies.
But of course, having schizophrenia can also be really difficult and painful for the people who have it. That's why scientists are still studying this illness and trying to figure out how to help people who are affected by it.