Complex sentence: Mohun was appointed US Consul to Zanzibar on 25 May 1895, this appointment, which he held until 22 November 1897, may have been a reward for his work in the Congo.
Split into simpler sentences: Mohun was appointed US Consul to Zanzibar on 25 May 1895. This appointment, which he then held until 22 November 1897, may have been a reward for his work in the Congo.