Complex sentence: Identified by Sir David Bruce in 1887, Malta fever was characterised by a low mortality rate, but was of indefinite duration accompanied by profuse perspiration, pain and occasional swelling of the joints.
Split into simpler sentences: Identified by Sir David Bruce in 1887, Malta fever was characterised by a low mortality rate but was of indefinite duration. It was accompanied by profuse perspiration, pain and occasional swelling of the joints.