Complex sentence: Pyrus; a young, undisciplined and lazy nisse boy, is going to be Gyldengrød's trainee for a year on the National Archives of Denmark but the only thing that Pyrus cares about is where he's going to sleep and when he's going to eat.
Split into simpler sentences: Pyrus; a young, undisciplined and lazy nisse boy, is going to be Gyldengrød's trainee for a year on the National Archives of Denmark. But the only thing that Pyrus care about is where he's going to sleep and when he's going to eat.