It is really confusing without context. Feels like you're coming in halfway through a conversation. A bit "Sharon was T-Rexing in the supermarket".
I think it is assuming that you're already aware of the context of the case. It sounds like it has been covered widely in Welsh media, and when a case is covered widely you do often get articles which assume all readers know what is being referred to. I'm not in Wales and this is the first I've heard of it - if I wanted to know about the start of it, I think I'd click on the link about halfway down showing related articles, the one titled "Church in Wales calls for investigation of diocese" - how annoying, I can't stop this being a link now, but anyway, that seems to be the most likely title to take me to the start of the story.