Original: Between 1933 and 1934, the British chemists Sir Walter Norman Haworth and Sir Edmund Hirst and, independently, the Polish chemist Tadeus Reichstein, succeeded in synthesizing the vitamin, making it the first to be artificially produced.
Simplified: In 1933/1934, the British chemists Sir Walter Norman Haworth and Sir Edmund Hirst, and separately the Polish Tadeus Reichstein, had success in making the vitamin.