Okay, kiddo. So, Rennie and Klein were two people who had a disagreement. Rennie said that Klein hurt her foot while they were playing together. But Klein said he didn't do it, and that Rennie just hurt herself by accident.
So, Rennie took Klein to court to try and prove that it really was his fault. They had a trial, where Rennie and Klein told their sides of the story to a judge. The judge listened to both of them and looked at any evidence they had, like pictures of Rennie's foot or witness testimony from other people who saw what happened.
In the end, the judge decided that Rennie didn't have enough proof that Klein was the one who hurt her foot. So, the judge said that Rennie couldn't get any money or compensation from Klein for her injury.
It's kind of like when you and your friend argue over something at school, and the teacher listens to both of you and decides who is right. Except in this case, it was a judge in a courtroom deciding who was right about Rennie's foot injury.