Complex sentence: At the end of the war Napier was made a Companion of the Bath (4 June 1815) and married Frances Elizabeth Elers, née Younghusband, generally referred to as Eliza, whom he had known and loved in Edinburgh while still a teenager.
Split into simpler sentences: At the end of the war Napier was made a Companion of the Bath (4 June 1815). He married Frances Elizabeth Elers, née Younghusband, generally referred to as Eliza, whom he had known and loved in Edinburgh while still a teenager.