Complex sentence: In 1907, the Dashnaktsutiun joined the Second International until its dissolution during World War I. It later joined the reformed Socialist International and remained a full member until 1960, when it decided to pull out of the organization.
Split into simpler sentences: In 1907, the Dashnaktsutiun joined the Second International, which was later reformed as the Socialist International. It remained a full member until 1960, when it decided to pull out of the organization.