Complex sentence: The largest producer of hydrothermal emeralds today is Tairus in Russia, which has succeeded in synthesizing emeralds with chemical composition similar to emeralds in alkaline deposits in Colombia, and whose products are thus known as "Colombian Created Emeralds" or "Tairus Created Emeralds".
Split into simpler sentences: The largest producer of hydrothermal emeralds today is Tairus in Russia. They have succeeded in synthesizing emeralds that have similar chemical composition as emeralds in alkaline deposits in Colombia, hence they are called "Colombian Created Emeralds" or "Tairus Created Emeralds".