Complex sentence: National Sections of the Order were organized in as many as forty countries, and in 1921 the first "International Star Congress" was held in Paris, France, attended by 2,000 members out of then about 30,000 worldwide.
Split into simpler sentences: National Sections of the Order were organized in as many as forty countries. In 1921, the first "International Star Congress" was held in Paris, France, attended by 2,000 members out of then about 30,000 worldwide.