Complex sentence: During the Franco-Malagasy War (1881-1885) French citizens were arrested and herded into concentration camps Berthieu thus finds itself in Tamatave where he volunteered as a military chaplain.
Split into simpler sentences: During the Franco-Malagasy War (1881-1885), French citizens were arrested and herded into concentration camps. Thus Berthieu found itself in Tamatave where he volunteered as a military chaplain.