Complex sentence: The site of the school's first building stands on that of the Victorian mansion of the famed gold prospector B.H. Holtermann, a German migrant who discovered the Holtermann Nugget in the Australian gold fields.
Split into simpler sentences: The site of the School's first building stands on that of the Victorian mansion of the legendary gold prospector BH Holtermann. Holtermann was a German migrant who discovered the famous Holtermann Nugget in the Australian gold fields.