Complex sentence: He was the presiding Catholicos when the Democratic Republic of Armenia was established in May 1918 and supported the various military campaigns refusing to relocate the catholicosate from Etchmiadzin to a safer venue.
Split into simpler sentences: He was the presiding Catholicos when the Democratic Republic of Armenia was established in May 1918. He supported the various military campaigns, refusing to relocate the catholicosate from Etchmiadzin to a safer venue.