Complex sentence: There had always been a previous hospital known as the Fever Hospital and Sanatorium which once occupied one corner of the current site, specialising in infectious diseases and tuberculouis which along with the former Cottage and Hunter hospitals were the only ones in the town.
Split into simpler sentences: There had always been a previous hospital known as the Fever Hospital and Sanatorium which once occupied one corner of the current site, specialising in infectious diseases and tuberculouis. The sanatorium along with the former Cottage and Hunter hospitals were the only ones in the town.