Complex sentence: The name of Sokolsky is known now mostly due to his opening research and developments (1.b4 which became known as Sokolsky's Opening in the Soviet Union) which is also known as Polish, or Orangutan Opening, named by Tartakower in 1924.
Split into simpler sentences: The name of Sokolsky is known now mostly due to his opening research and developments 1.b4 which became known as Sokolsky's Opening. It is also known as Polish, or Orangutan Opening, named by Tartakower in 1924.